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OverviewThe Brexit StoryWhat happened since Brexit?Local StoriesRobustness
South West / ITL1 TLK
ITL1 TLK

South West

Tracing the local economic footprint of Brexit through production and household income.

South West
GVA gap in 2023
−£16,811m
GVA shows the stronger divergence.
Average GVA gap since 2016
−£6,176m
Persistent negative gap over the post-Brexit era.
GDHI gap in 2023
−£746m
GDHI is nominal and may understate real effects.
How to read this place report
  1. Overview — headline output and income gaps and how they evolve.
  2. The Brexit Story — the causal chain from austerity and immigration panic to the Brexit vote and its economic costs.
  3. What happened since Brexit? — trade exposure, immigration, and interpretive context.
  4. Local Stories — mapped reporting and evidence linked to this geography.
  5. Robustness — placebos, donor pools and method notes.

1. Headline outcomes

Metric
Treatment window
Gross Value Added (GVA)
£ million (real chained-volume measure, nominal for GDHI)
GVA · Post-2016
The post-2016 gap is around −£16,811m in 2023 (−9% vs. synthetic path).
GVA gap path
Observed minus synthetic control (£m)
By 2023 the GVA gap is −£16,811m relative to the synthetic path.
Reading the result
  • By 2023, observed post-2016 GVA is £170.8bn against a best synthetic path of £187.6bn, leaving a shortfall of £16.8bn or -9.0%. That is a material real-output gap relative to the best synthetic comparison.
  • The post-2016 GVA gap is not just an endpoint effect: it is negative in five of the eight post-treatment years and stays negative throughout 2020-2023, moving from -£13.6bn in 2020 to -£16.8bn in 2023. Across 2016-2023 the cumulative shortfall is about £49.4bn, equivalent to roughly £8,503 per person, with a 2023 output shortfall of about £2,893 per person.
  • The post-2020 GVA window points in the same direction but is less severe: by 2023 observed GVA is £170.8bn versus a best synthetic £176.5bn, a gap of -£5.7bn or -3.2%. That later-window estimate therefore weakens the size of the post-2016 shortfall, but it does not reverse the negative real-output reading.
  • GVA is the cleaner local-output measure here: it is production-side and measured as real chained-volume output, while GDHI is nominal resident income and can include transfers, pensions, capital income, social security, and labour income earned elsewhere. GDHI is still useful context — in 2023 its post-2016 gap is -£0.7bn versus the GVA gap of -£16.8bn — but the classification remains based on GVA.
South West / ITL1 TLK

Local stories

Local reporting linked to South West.

South West
Local stories

South West

50 distinct local stories are currently linked to South West. Coverage runs from 2019 to 2026. The dominant storylines revolve around Costs & paperwork, Export barriers, and Relocation & investment, with the most common cited channels being Customs and border administration, Regulatory burden or simplification, and Wage and employment channel.

  • 28 of 50 stories describe a negative local effect, most often through Customs and border administration, Regulatory burden or simplification, and Wage and employment channel.
  • The most common local story themes are Costs & paperwork (37), Export barriers (32), and Relocation & investment (27).
  • 25 stories cite a concrete figure or reported statistic, including up to £210m in direct fees and £1.1bn in 2016 to £929m in 2023.
Mechanisms most cited

50 linked stories

Customs and border administration
12
Regulatory burden or simplification
11
Wage and employment channel
9
Global value-chain disruption
6
Investment wait-and-see
4
Export demand and market access
3
FDI and location choice
2
Digital and data systems
1
Common themes
Costs & paperwork
37
Export barriers
32
Relocation & investment
27
Labour & staffing
22
Sales & demand
22
Delays & disruption
20
Sectors most mentioned
AI regulation / digital services
1
Aerospace R&D / Airbus wing systems
1
Aerospace R&D and manufacturing
1
Aerospace engineering / Airbus supply chain
1
Agri-food and seafood exports
1
Agriculture, dairy and rural labour supply
1

Stories

The Guardian5 June 2026Music, live performance and creative exports

Bristol, City of: musicians face lower EU work and tour earnings after Brexit

In Bristol, City of, music venues, promoters and independent performers are exposed to the same post-Brexit touring barriers described in Guardian reporting on UK musicians. The report found that more than a quarter of UK musicians had lost all EU work since 2021, nearly half had seen EU opportunities reduced, average tour earnings had fallen by 45%, and 59% said European touring was no longer viable. For a city or regional music economy, the mechanism is a loss of exportable live-work opportunities, fewer inbound and outbound tours, weaker collaboration and lower income for small artists and venues that depended on frictionless EU mobility.

The Guardian4 June 2026Steel / metal manufacturing exports

Gloucestershire CC: Steel / metal manufacturing exports Brexit exposure

Gloucestershire CC has steel, metals, machinery or heavy-manufacturing exposure that can be affected by the EU plan to reduce tariff-free steel import quotas. Guardian reporting described proposed quota reductions from July 2026 and warnings of a devastating impact on UK steel exports. For firms in Gloucestershire CC, the relevant channel is not only a tariff risk: customers using steel in automotive, machinery, construction materials and industrial components may face higher uncertainty over EU market access, order timing and whether UK supply can remain integrated into continental value chains.

The Guardian1 June 2026Creative industries / actors / performing arts exports

Bristol screen creative workers face fewer EU jobs after Brexit

In Bristol screen and creative industries, creative workers are exposed to post-Brexit restrictions on EU work, auditions and touring. Guardian reporting described UK actors being shut out of EU jobs by visa rules, taxes, social-security deductions and documentation costs, and reported that performing-arts exports to the EU fell from £1.1bn in 2016 to £929m in 2023. For local theatres, screen firms, agencies and freelance performers, the impact is a loss of reachable labour-market opportunity: entry-level EU contracts, cruise-ship work and theatre tours became harder or uneconomic, especially for less wealthy performers.

The Guardian31 May 2026Regional productivity, investment and labour-market performance

Devon CC: Brexit linked to weaker GDP, investment, employment and productivity

In Devon CC, the regional-prior layer treats productivity as a key route from Brexit exposure to living standards. Guardian reporting summarised research suggesting that UK GDP per head, investment, employment and productivity are lower than under a remain scenario, with business investment frozen by uncertainty and trade frictions. For local economies, this source family is best used as macro context: it helps interpret why regions with high trade exposure, high-value services or capital-intensive industries may show weaker output per worker after Brexit.

The Guardian28 May 2026Agri-food and seafood exports

Cornwall food and seafood exporters face certificate costs until SPS reset takes effect

In Cornwall and the Isles of Scilly, fish, meat, dairy and food producers remain exposed to export paperwork until the new UK-EU SPS arrangement takes effect. Guardian reporting on the food-export deal said paperwork and physical checks on key food exports are expected to end from summer 2027, but that certificates have cost up to £200 per consignment since Brexit. The local impact is that smaller producers must continue to price in certificates, veterinary checks and border administration before EU sales become easier, making low-margin or small-batch exports less attractive in the interim.

Reuters / Federation of Small Businesses5 May 2026SMEs / exporters

Cornwall and Isles of Scilly: Brexit impact on SMEs / exporters

In Cornwall and Isles of Scilly, small firms trading with the EU faced continuing post-Brexit pressure from red tape, rising costs and complex rules. Reuters reported Federation of Small Businesses research in May 2026 warning that small UK firms were being pushed out of EU markets as bureaucracy and operating costs made cross-border sales harder to sustain. The impact for local SMEs was a smaller reachable market: firms that had once treated nearby EU customers as ordinary export opportunities increasingly had to absorb customs administration, VAT complexity, delivery uncertainty and compliance work before a sale became worthwhile.

The Times17 March 2026Farm and seafood exports

Cornwall and Isles of Scilly: Farm and seafood exports Brexit impact evidence

In Cornwall and Isles of Scilly food and seafood exporters, post-Brexit export-health paperwork adds a concrete cost channel for food, livestock, dairy, meat and seafood businesses. The Times reported that British food exporters have had to apply for more than one million export health certificates since 2023, with certificates costing between £80 and £200 for fish and seafood and £113 to £200 for meat and dairy. For local producers in this sector, the effect is a recurring consignment-level charge layered on top of staff time, border inspections and phytosanitary fees, making small or frequent EU shipments less profitable.

Reuters19 February 2026aerospace and clean-tech supply chains

Bath & North East Somerset and South Gloucestershire: aerospace and clean-tech supply chains exposed to post-Brexit goods-trade frictions

In Bath & North East Somerset and South Gloucestershire (Bristol / South Gloucestershire), aerospace and clean-tech supply chains face a Brexit-linked physical-goods trade problem. Reuters reported that the UK minister for EU relations warned that strict EU 'made in Europe' preference requirements could damage deeply integrated UK-EU supply chains, especially in strategic clean-energy and advanced-manufacturing sectors. The local exposure is that EU preference rules can treat UK-made components as outside the eligible European production base, weakening the economics of cross-border sourcing and making future investment depend on whether UK sites are recognised as part of European supply chains.

Financial Times17 February 2026Transport / ports / customs digitalisation

Plymouth: Transport / ports / customs digitalisation — UK quietly shelves £110mn frictionless post-Brexit trade border projec

In Plymouth, south-west port and marine logistics firms face the Brexit-related pressure described in Financial Times reporting on transport / ports / customs digitalisation. The source records shelving of the £110mn Single Trade Window digital-border project. For Plymouth, the local economic impact is that firms with EU customers or cross-border supply chains must absorb extra administration, delays, compliance work or route uncertainty before output reaches its market. This changes margins, customer reliability and investment incentives, particularly for smaller firms without large customs, logistics or regulatory teams.

The Guardian7 February 2026Farm products / food exports

Cornwall and Isles of Scilly: Farm products / food exports Brexit impact

In Cornwall and the Isles of Scilly, farmers and food producers face the wider post-Brexit export downturn reported in NFU analysis. The Guardian reported that British agricultural exports to the EU fell by 37.4% between 2019 and the five years after Brexit, with declines in poultry, beef, dairy and lamb. For local producers, this matters because reduced EU demand is not easily reversed: once European retailers and wholesalers fill supply chains with other products, Cornish and island food exporters may face a slower, costlier path back into those markets even if future UK-EU rules are eased.

The Guardian13 January 2026Road haulage / meat and food exports

Wiltshire logistics firm describes food-export paperwork as a transport bottleneck

In Wiltshire and along the export corridor, Broughton Transport gave MPs a concrete account of how post-Brexit food-export paperwork disrupts physical-goods movements. The Guardian reported Toby Ovens describing veterinary paperwork that expanded from a simple pre-Brexit process into bundles requiring many stamps, with errors forcing last-minute interventions while lorries were already heading for Dover. One reported case involved a refrigerated meat lorry held in Calais for 27 days after a paperwork error, creating a large cost for the customer. The local economic impact is transport capacity tied up in administration, higher refrigerated logistics costs, and greater risk that food consignments become uneconomic or unreliable.

The Guardian21 December 2025Manufacturing / steel, aluminium, car parts and CBAM-exposed exports

Bristol, City of: Manufacturing / steel, aluminium, car parts and CBAM-exposed exports — UK failure to seal EU tax exemption hands industry mountain of paperwo

In Bristol, City of, advanced engineering and aerospace suppliers face the Brexit-related pressure described in The Guardian reporting on manufacturing / steel, aluminium, car parts and cbam-exposed exports. The source records CBAM paperwork for about £7bn of exports including steel, aluminium, washing machines, car parts, cement and fertiliser. For Bristol, City of, the local economic impact is that firms with EU customers or cross-border supply chains must absorb extra administration, delays, compliance work or route uncertainty before output reaches its market. This changes margins, customer reliability and investment incentives, particularly for smaller firms without large customs, logistics or regulatory teams.

The Guardian21 November 2025Health services and skilled labour availability

Bristol, City of: health systems face loss of overseas-trained staff

In Bristol, City of, health-service labour availability matters for local productivity because untreated ill-health and staffing shortages feed back into workforce participation. Guardian reporting said 4,880 overseas-trained doctors left the UK in 2024, a 26% rise, while 42% of the UK medical workforce had qualified abroad. For regional health economies, the issue is that a less welcoming post-Brexit labour environment can reduce retention of skilled staff, worsening waiting times and constraining local labour-market participation.

Reuters19 November 2025AI regulation / digital services

Bristol, City of: AI regulation / digital services Brexit/data/regulatory exposure

In Bristol, digital and creative-tech firms selling tools, AI systems or software services into European markets face an EU regulatory environment that keeps changing after Brexit. Reuters reported that the European Commission proposed easing parts of its digital rulebook, including delays to high-risk AI rules and reduced documentation for smaller companies. For a regional tech cluster, this creates a dual effect: EU simplification can lower the burden of serving European clients, but UK firms still have to follow rule changes from outside the EU policymaking process. Product design, contracts and compliance capacity become part of the cost of exporting digital services.

MusicRadar1 November 2025Music / touring and creative exports

Bristol musicians face continued Brexit drag on touring income

In Bristol’s music and creative economy, Brexit continues to appear as a touring and earnings constraint even as the wider UK music sector grows. MusicRadar reported UK Music findings that the industry generated £8bn in 2024, but 32% of surveyed creators said Brexit affected their livelihood and 95% of those reported lower earnings as a consequence. For Bristol-based artists, venues, managers and technical crews, the impact is higher friction on EU touring: paperwork, visa uncertainty, cabotage rules and tax issues can turn smaller European tours from a growth route into a financial risk.

The Guardian31 October 2025Financial services productivity and investment

Bristol, City of: finance-sector productivity weakened after Brexit

In Bristol, City of, the productivity channel matters because the local economy either depends directly on high-productivity services or on demand generated by them. Guardian reporting linked weaker UK productivity forecasts to Brexit, noting finance-sector weakness, loss of market share and reduced investment after the UK left the EU. For regional centres with financial, professional or advanced-service employment, the impact is not only jobs lost but slower output per worker growth and a weaker local tax and spending base.

The Guardian18 October 2025Shellfish exports / mussels

Devon CC: Shellfish exports / mussels Brexit impact

In south Devon, Offshore Shellfish suffered a reported £150,000 loss after French customs rejected three mussel shipments. The Guardian reported that the Lyme Bay business had continued exporting to EU customers after Brexit despite paperwork, but saw three out of four recent lorries blocked at Boulogne-sur-Mer. The local impact was a perishable-export shock: transport and production costs had already been incurred, but inconsistent border interpretation destroyed consignment value and threatened customer relationships.

The Guardian5 October 2025Agriculture, dairy and rural labour supply

Cornwall and Isles of Scilly: farms face labour-force risk after visa changes

In Cornwall and Isles of Scilly, farming and rural food businesses are exposed to labour-force constraints described in Guardian reporting on Scottish dairy farms. The article explained that farms had turned to overseas skilled workers after failing to recruit locally, but changes to visa eligibility put this workforce model at risk. For rural economies, the impact is not only on farm output; dairies, cheese creameries, contractors and local suppliers all depend on whether farms can staff milking, livestock care and processing work.

The Guardian26 August 2025Food, drink and agriculture exporters

Cornwall and Isles of Scilly: Brexit impact on Food, drink and agriculture exporters

In Cornwall and Isles of Scilly, food, drink and agricultural exporters faced higher fixed costs when selling into the EU after Brexit. Guardian reporting found that export licences and certificates for UK food and agricultural products cost between £113 and £200 each, with annual business costs estimated at up to £65m. For smaller producers, the impact was that even when demand remained, individual consignments became more expensive to process, margins were squeezed, and low-value EU orders could be cancelled or consolidated because the paperwork cost no longer matched the value of the shipment.

Financial Times28 July 2025aerospace and high-value goods exports

Bath & North East Somerset and South Gloucestershire: aerospace and high-value goods exports exposed to post-Brexit goods-trade frictions

In Bath & North East Somerset and South Gloucestershire (Bristol), aerospace and high-value goods exports face a Brexit-linked physical-goods trade problem. The Financial Times reported that goods fell to a record-low share of UK exports, with declines in cars, chemicals and machinery and analysis attributing manufacturing weakness in large part to Brexit-related trade frictions. The local exposure is through a national goods-export downturn that falls most heavily on places with cars, chemicals, machinery, aerospace or port-linked goods trade; lower goods-export volumes weaken demand for local manufacturing and logistics capacity.

The Times3 July 2025SME food manufacturing exports

Gloucestershire CC: The Times reported that Portsmouth-based Chilli Mash won an £11m Belgian superma

In Gloucestershire, the source evidence points to a Brexit-linked physical-goods trade channel. The Times reported that Portsmouth-based Chilli Mash won an £11m Belgian supermarket deal only after navigating post-Brexit customs, VAT and paperwork with government trade-adviser help. For SMEs, the story shows that EU demand can exist but the fixed compliance burden requires specialist assistance and creates a hurdle before exports scale.

The Times25 May 2025perishable food logistics and cold chain

Devon CC: perishable food logistics and cold chain exposed to post-Brexit goods-trade frictions

In Devon CC (Devon), perishable food logistics and cold chain face a Brexit-linked physical-goods trade problem. The Times reported that food and flower producers, importers and cold-chain logistics firms invested millions in facilities and training for post-Brexit SPS checks, only for policy delays to leave some investments underused or uncertain. The local exposure is through border-infrastructure uncertainty: importers, cold-chain operators and fresh-produce firms can invest in systems, training and inspection facilities, only for policy delays to leave capacity uncertain and planning horizons shorter.

The Guardian20 May 2025Seafood exports / fish-market logistics

Torbay: Seafood exports / fish-market logistics Brexit impact

In Brixham, fish merchant Ian Perkes said fish exports were down 20% since Brexit because of extra costs and paperwork. The Guardian reported that his daily paperwork had risen from three pieces to at least 30, with health checks and document errors causing costly rejected consignments. The local impact was a fixed-cost shock to seafood exporting: the auction, merchant and haulier network still had demand for fish, but paperwork, certification and border risk made each EU shipment more expensive and less reliable.

The Guardian21 March 2025Health and social care labour supply

Bristol, City of: NHS shifts recruitment away from EU toward red-list countries

In Bristol, City of, health and care services face a changed post-Brexit labour market. Guardian reporting described the NHS becoming more dependent on staff from WHO red-list countries after the UK left the EU single market, with 65,610 clinicians and support staff from those countries employed in England and 32,935 joining since the start of 2021. For local economies, this shows how Brexit did not eliminate migration needs; it changed recruitment geography, raising ethical and retention concerns while keeping health services dependent on international labour.

The Times17 March 2025food, dairy and farm-product exports

Cornwall and Isles of Scilly: food, dairy and farm-product exports exposed to post-Brexit goods-trade frictions

In Cornwall and Isles of Scilly (Cornwall), food, dairy and farm-product exports face a Brexit-linked physical-goods trade problem. The Times reported that cheese exports to the EU fell after Brexit, with artisan exporters facing veterinary bills, health certificates, customs paperwork, longer shipment times, and in some cases the need to use intermediaries rather than direct EU sales. The local exposure is the same small-consignment problem described for cheese exporters: veterinary paperwork, customs declarations and longer routes make direct EU sales harder, particularly for perishable or artisan products whose margins cannot absorb repeated certificate costs.

The Guardian18 February 2025Architecture, construction services and professional labour

Bristol, City of: architecture firms face post-Brexit recruitment constraints

In Bristol, City of, architecture and construction-services firms are exposed to the professional-labour constraint described by Guardian reporting on post-Brexit visa salary rules. The article reported that architecture was removed from the shortage occupation list and the salary threshold rose from just over £26,000 to £45,900, making it harder to retain international graduates and staff projects. For urban economies, this links Brexit to housing delivery, project delays and the productivity of design-led construction services.

Reuters31 January 2025Port logistics and food imports

Plymouth: Port logistics and food imports Brexit impact evidence

In Plymouth food importers and port users, the delayed third phase of Britain’s post-Brexit border regime matters because importers must provide more detailed safety and security declarations for EU goods. Reuters reported that the new phase followed earlier certification, physical checks and charges on products such as meat, fish, cheese, eggs, dairy products and cut flowers. For local ports, hauliers and distributors, the impact is more information work before goods move smoothly: consignments need declarations, risk checks and sometimes inspections, increasing the administrative load for smaller importers and time-sensitive supply chains.

British Chambers of Commerce30 January 2025Exporters

Cornwall and Isles of Scilly: Brexit impact on Exporters

In Cornwall and Isles of Scilly, exporters faced a weak growth payoff from the post-Brexit trading settlement. The British Chambers of Commerce reported in January 2025 that 41% of exporters disagreed that the Brexit deal was helping them grow sales, while only 14% agreed. The impact was felt through sales pipelines and confidence: firms trying to sell into EU markets faced paperwork, checks and rules that made growth harder, leaving local exporters with higher transaction costs and fewer easy routes to expand beyond the domestic market.

Vogue Business1 January 2025Textile and apparel manufacturing

Gloucestershire CC: Textile and apparel manufacturing Brexit exposure

Gloucestershire CC has textile, apparel, garment-finishing or fashion-manufacturing exposure. Vogue Business reported that Brexit ended frictionless trade for UK manufacturers, increasing customs delays and costs while weakening exports to the EU; Patrick Grant of Community Clothing described Brexit as a disaster for manufacturing because it made buying from and selling into Europe harder. For producers in Gloucestershire CC, the local mechanism is supply-chain thinning: if small dye houses, cutters, mills or component suppliers close or lose EU orders, the whole local manufacturing ecosystem becomes less resilient.

The Times1 December 2024Aerospace R&D and manufacturing

Bath & North East Somerset and South Gloucestershire: Aerospace R&D and manufacturing Brexit impact

In Filton and South Gloucestershire, Airbus’s wing design and aerospace-engineering capability is part of a European aviation value chain that must coordinate research, testing, certification and production across borders. The Times reported on Airbus’s folding-wing work, naming Filton and Broughton as central UK sites for future wing technology. The local Brexit-relevant risk is not a single tariff: it is the possibility that regulatory divergence, certification friction or weakened EU collaboration makes it harder for UK aerospace sites to remain fully embedded in Airbus’s European product-development cycle.

Reuters16 October 2024Financial services / fintech and professional services

Bristol, City of: Financial services / fintech and professional services — City of London chief says Brexit disaster cost 40,000 finance jobs

In Bristol, financial and professional-service firms face the Brexit-related pressure described in Reuters reporting on financial services / fintech and professional services. The source records City of London Lord Mayor estimated Brexit cost about 40,000 finance jobs. For Bristol, City of, the local economic impact is that firms with EU customers or cross-border supply chains must absorb extra administration, delays, compliance work or route uncertainty before output reaches its market. This changes margins, customer reliability and investment incentives, particularly for smaller firms without large customs, logistics or regulatory teams.

The Times8 September 2024Aerospace R&D / Airbus wing systems

Bristol, City of: Aerospace R&D / Airbus wing systems

In Bristol, Airbus Filton sits inside the same European production geography as Broughton, Toulouse, Hamburg and Getafe. The Times described the Beluga system as the glue of UK Airbus manufacturing, with Filton linked to wing design, fuel systems, landing gear and intellectual property. For Bristol’s aerospace cluster, Brexit’s economic effect is therefore a value-chain risk rather than only a customs cost: the city’s high-value engineering activity depends on continuing participation in European aircraft programmes, seamless movement of components and confidence that future workshare will not migrate toward EU sites.

Reuters14 August 2024Engineering services and professional qualification recognition

Bristol, City of: engineers seek non-EU recognition routes after Brexit

In Bristol, City of, engineering and technical-service firms are affected by post-Brexit professional-recognition frictions and by the search for alternative routes to market access. Reuters reported that UK and US engineering bodies reached a mutual-recognition agreement to make it easier for engineers to have qualifications recognised and provide cross-border services. For local engineering clusters, the relevance is that leaving the EU made recognition of professional services a live trade issue: firms need recognised credentials, mobile staff and trusted standards to sell services internationally.

The Times30 June 2024Horticulture / new potatoes

Cornwall and Isles of Scilly: Horticulture / new potatoes Brexit impact

Near Penzance, The Times reported that the last small grower on the “Golden Mile” growing early potatoes had given up, as part of a wider contraction among small and medium farms. Riverford’s Guy Singh-Watson linked the disappearance of British early potatoes for his boxes to low returns, post-Brexit labour shortages and bad weather. The local impact in Cornwall is a farm-exit story: labour availability and weak margins reduced the viability of small horticulture operations, narrowing the domestic supply base for seasonal produce.

The Guardian29 June 2024Arts venues / live music / creative industries

Bristol creative venues face Brexit as one accelerator of touring and cost pressure

In Bristol’s arts and live-music economy, Guardian reporting on the crisis in the arts sector described Brexit as part of a wider shock alongside Covid, funding cuts and the cost-of-living squeeze. The article highlighted how venues and touring artists were being squeezed by rent, energy, wage and supply costs, while musicians struggled to make touring pay. For creative cities, the local economic effect is a thinner grassroots pipeline: fewer viable venues and tours reduce artist incomes, audience spending and the cultural infrastructure that supports hospitality and night-time economies.

The Guardian23 June 2024Musical instruments / second-hand goods trade

Gloucestershire CC: Musical instruments / second-hand goods trade Brexit impact

In Gloucestershire, Amber Violins’ owner said Brexit rules destroyed the scale of a business that had relied on buying second-hand instruments in France and selling them through an auction website. The Guardian reported that sales fell from around 1,000 units a year to about 40 after full VAT treatment, shipping agents and bureaucracy made the old model unworkable. The local impact was a collapse in viable small-consignment trade: the business survived by focusing on higher-value items but lost the volume that had supported the earlier model.

Reuters / Make UK16 June 2024Manufacturing / exporters

Gloucestershire CC: Manufacturing / exporters — UK industry wants better strategy and EU ties from next government, Ma

In Gloucestershire, advanced engineering and specialist manufacturers face the Brexit-related pressure described in Reuters / Make UK reporting on manufacturing / exporters. The source records Make UK survey: 69% wanted a credible industrial strategy and 54% wanted enhanced EU trade ties. For Gloucestershire CC, the local economic impact is that firms with EU customers or cross-border supply chains must absorb extra administration, delays, compliance work or route uncertainty before output reaches its market. This changes margins, customer reliability and investment incentives, particularly for smaller firms without large customs, logistics or regulatory teams.

The Guardian25 May 2024Tourism, visitor attractions and hospitality labour

Cornwall and Isles of Scilly: tourism attractions face staff shortages after Brexit

In Cornwall and Isles of Scilly, tourism and visitor-economy businesses are exposed to the same labour-market constraint described in Guardian reporting on royal residences and wider attractions. The article reported that tourism employers struggled to recruit front-of-house, retail and catering staff after Brexit and the pandemic, with UKHospitality estimating 132,000 vacancies and an 11% vacancy rate in the sector. For local tourism economies, the impact is reduced opening capacity, higher wage pressure, shorter seasons and weaker export earnings from visitors.

Reuters22 April 2024Fine food importers and wholesalers

Bristol, City of: Reuters reported that new border checks on meat, fish, cheese, dairy products an

In Bristol food retailers, the source evidence points to a Brexit-linked physical-goods trade channel. Reuters reported that new border checks on meat, fish, cheese, dairy products and some flowers risked stifling fine-food imports from the EU, with small producers and retailers facing paperwork and higher costs. For local wholesalers, restaurants and independent retailers, import frictions raise landed costs and reduce the variety and freshness of inputs available to customers.

The Guardian14 April 2024Restaurants, hospitality and EU labour supply

Bristol, City of: restaurants face loss of EU staff and higher visa thresholds

In Bristol, City of, hospitality businesses face the kind of labour-market pressure described in Guardian reporting on Italian restaurants after Brexit. The article described how salary thresholds and post-Brexit visa rules made it much harder to recruit and retain EU chefs and waiting staff, with employers warning that authenticity, service quality and business viability were affected. For a local restaurant economy, labour availability becomes a production constraint: fewer experienced workers mean reduced opening hours, higher wages, thinner margins and sometimes exit risk for independent firms.

Reuters13 March 2024Semiconductors / deep tech / research and innovation

Bristol semiconductor and deep-tech firms regain a route into EU research funding

In Bristol / semiconductor and deep-tech engineering, high-tech firms and university-linked labs depend on access to collaborative research funding, specialist talent and European supply-chain networks. Reuters reported that Britain joined an EU semiconductor research programme, committing £35m to a €1.3bn research and innovation fund, after having rejoined Horizon Europe. For local semiconductor and deep-tech ecosystems, the Brexit-related issue is that access to European innovation funds and consortia had been stalled by post-Brexit disputes; re-entry creates opportunities, but firms lost time in a subsidy race where speed, collaboration and talent networks matter.

The Guardian21 February 2024Food manufacturing / EHC administration

Torbay: Food manufacturing / EHC administration — Brexit has cost UK food companies exporting to EU an extra £170m

In Torbay, Brixham seafood exporters face the Brexit-related pressure described in The Guardian reporting on food manufacturing / ehc administration. The source records food exporters faced about £170m in extra costs linked to veterinary sign-offs and certificates costing about £200. For Torbay, the local economic impact is that firms with EU customers or cross-border supply chains must absorb extra administration, delays, compliance work or route uncertainty before output reaches its market. This changes margins, customer reliability and investment incentives, particularly for smaller firms without large customs, logistics or regulatory teams.

The Guardian19 May 2023Battery manufacturing / automotive supply chain

Somerset battery investment tied to UK-EU EV local-content rules

In Somerset, the proposed battery gigafactory illustrates how Brexit-era automotive rules of origin turned regional investment into a strategic supply-chain issue. Guardian reporting said the UK offered Tata, owner of Jaguar Land Rover, a large subsidy package to build a battery plant in Britain while Spain was also under consideration. The local economic significance is that battery production in Somerset would help UK-made electric vehicles satisfy local-content requirements and avoid tariffs in EU trade. Without domestic battery capacity, carmakers warned that UK plants could be weakened by dependence on overseas batteries. The mechanism links regional investment, electric-vehicle supply chains and export-market access.

ITV News10 June 2022Seafood exports / fish market

Brixham fish merchant reports daily export-paperwork costs

In Brixham, ITV News reported from the fish market that merchant Ian Perkes faced customs declarations, export health certificates and VAT paperwork after Brexit. The local impact is a daily fixed cost on seafood exports: before a consignment reaches an EU customer, the exporter pays in documentation, professional compliance and delay risk, squeezing margins in a perishable port economy.

Vogue1 February 2021Fashion, textiles and retail logistics

Bristol, City of: Fashion, textiles and retail logistics Brexit exposure

Bristol, City of has textile, fashion, retail or e-commerce exposure that can be hit by rules-of-origin and customs frictions. Vogue reporting described luxury brands and small fashion firms facing delivery delays, duties, returns problems and complicated origin rules after Brexit. For firms in Bristol, City of, the impact is a fragmentation of what used to be a simple UK-EU retail and wholesale market: returns, stock movements and customer deliveries require more paperwork, while small brands have less capacity to split supply chains between the UK and EU.

Pitchfork22 January 2021Music touring, festivals and small venues

Bristol, City of: touring crisis raises costs for small artists and venues

In Bristol, City of, small venues and emerging artists are exposed to the touring frictions described by Pitchfork after the UK left the EU. Visa uncertainty, work-permit rules, carnets and transport restrictions raised the fixed cost of touring Europe, which matters most for smaller artists whose margins are thin. The local economic effect is lower export reach for performers, fewer reciprocal European tours, and reduced work for venues, crews and promoters who rely on a steady flow of touring activity.

ITV News Wales21 January 2021Shellfish

Cornwall and Isles of Scilly: Brexit impact on Shellfish

In Cornwall and Isles of Scilly, shellfish exporters faced costly uncertainty when post-Brexit paperwork delayed consignments at EU entry points. ITV News Wales reported that Syren Shellfish’s first post-Brexit shipment was delayed at Caen, with the family business fearing a loss of up to £50,000 and suffering product mortality among spider crab and velvet crab. The impact was immediate and physical: live seafood lost value while waiting for clearance, cash flow was put at risk, and future EU shipments became commercially frightening rather than routine.

Wired7 March 2019Automotive manufacturing / supply chains

Bristol and wider automotive suppliers exposed to no-deal customs and tariff risk

For Bristol's engineering and advanced-manufacturing supply base, Wired's account of the UK car industry's Brexit exposure captures the supply-chain risk facing component and systems suppliers beyond the assembly plants themselves. The article described production falls, weak investment and manufacturers warning that no-deal customs and tariffs could make UK operations less viable. For local engineering firms, the problem is integration: if final assemblers move production or reduce volumes, upstream component, tooling and design work in regional supplier networks also loses demand.

The Guardian24 January 2019Aerospace engineering / Airbus supply chain

Bristol-Filton Airbus engineering exposed to no-deal supply-chain risk

In Bristol and Filton, Airbus’s UK operations were drawn into the Brexit supply-chain risk debate because the company’s UK sites design and support aircraft wings that are integrated into European production. Guardian live reporting in January 2019 relayed Airbus chief Tom Enders warning that a no-deal Brexit could force harmful decisions for UK operations, noting that Airbus employed more than 14,000 people in the UK and that 110,000 supply-chain jobs depended on its operations. The local impact is uncertainty over high-value engineering work and future workshare in a Europe-wide aerospace production system.

Devon Live source familyREVIEW_NEEDEDSeafood exports and port logistics

Cornwall and Isles of Scilly: Seafood exports and port logistics Brexit local/regional evidence

In Cornwall and Isles of Scilly, this local/regional source family points to Brexit-related pressure in Seafood exports and port logistics. Devon local-search evidence points to Brixham and Devon seafood exporters facing paperwork, health-certificate and border-timing frictions. This row is a source-family lead pending exact dated article replacement. For the evidence pack, the item is retained as a review-needed local-source lead and is mapped to the relevant goods-trade or supply-chain mechanisms without using it as statistical evidence.

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South West
The Full Story

How Britain Got Here

The conventional narrative of Brexit — that immigration drove the Leave vote — breaks down immediately when you look at the geography. The areas that voted most strongly to Leave were precisely those where EU immigration had been lowest. What they shared instead was a decade of austerity that hollowed out public services and stagnated wages.

But the political events that enabled Brexit — the referendum itself, and then the hardest possible form of it — required a specific chain of electoral shocks created by Britain's First Past the Post voting system operating in a multi-party environment. Scroll down to trace the full causal chain, with evidence at each step.

The DAG above highlights the relevant node or edge as each chapter comes into view. Charts and images appear on the right as the narrative develops.

2008

The Global Financial Crisis

The collapse of Lehman Brothers in September 2008 triggered the deepest global banking crisis since the 1930s. UK GDP contracted 4.2 % in 2009. Banks were recapitalised with public money. The fiscal position swung dramatically — a structural deficit that would define the next decade of British politics.

The crisis itself was concentrated in financial services and affected places like London and the South East most directly. But the political and fiscal response — the austerity that followed — would fall hardest on communities that had the least to do with the crash: post-industrial towns in the Midlands, North and Wales.

4.2%UK GDP contraction, 2009
£137bnPeak deficit as % GDP (2009–10)
£500bn+Public money committed to bank recapitalisation

The 2008 Shock

Selected UK macroeconomic indicators around the financial crisis

–4.2%
UK GDP growth in 2009 (worst since 1930s)
£500bn+
Public support committed to banking sector recapitalisation
10%
UK unemployment peak 2011 (from 5.2% pre-crisis)

The financial crisis created the fiscal deficit that would justify austerity — but its costs were socialised across communities that had not created it.

2010

Austerity Begins

The Cameron–Clegg Coalition's October 2010 Comprehensive Spending Review announced £83 billion in cuts over four years. The frame was national necessity: "we are all in this together." The reality was geographically uneven. Local government bore a disproportionate share — and local government spending was most critical to the communities already most economically fragile.

Between 2010 and 2015, English local authorities lost an average of 26 % of their real-terms funding. But the cuts were not distributed evenly. Councils serving the most deprived populations — which had higher needs and greater dependence on grant funding — faced cuts of 40 % or more. Libraries, youth centres, Sure Start children's centres, adult social care, and bus subsidies were hollowed out.

This is captured by the austerity index used in this analysis: a measure that combines both Welfare Reform Act impacts and local authority budget cuts between 2010 and 2015, capturing how areas were hit through multiple forms of large-scale spending reductions. The highest values cluster in post-industrial towns in the Midlands, North East and Wales — the same places that would later vote most heavily to Leave.

26%Average English council funding loss 2010–15
40%+Funding loss in most deprived councils
£83bnTotal announced cuts in 2010 CSR

Austerity by the Numbers

Local government funding cuts 2010–2015

Average English council funding loss –26%
Most deprived councils –40%+
Sure Start centres closed 2010–2019 1,000+
Public libraries closed 2010–2019 800+
2013

UKIP: Austerity's Political Voice

In the 2013 local elections UKIP won 23 % of the national vote, mostly in areas with low EU-origin immigration. This is the central paradox of the UKIP surge: it was loudest where EU migration was least visible.

Nigel Farage fused anti-austerity resentment with anti-immigration messaging. Communities that had experienced real decline — closed libraries, shuttered youth centres, longer NHS waiting lists — were given an explanation (immigration) and a villain (the EU). The cognitive dissonance was politically convenient: austerity was the cause, but it was politically harder to oppose than immigration.

The chart on the right (Panel B) shows this directly. The x-axis is the austerity index; the y-axis is UKIP vote share growth 2009–14. The upward slope is clear and consistent across all geographic levels. The chart asks whether austerity does more explanatory work than immigration in the UKIP surge.

UKIP's rise mattered structurally for two reasons: it put direct electoral pressure on David Cameron to call a referendum, and it would later (2015) split the vote in ways that completely reshaped the parliamentary map.

B. Austerity → UKIP growth

Austerity index (x) vs UKIP vote share growth, 2009–14 (y). Each bubble = a local authority; size ∝ √GVA 2016; colour = Brexit cost (red = larger loss).

2015 spring–summer

The Mediterranean Crisis

Crossings from North Africa and Turkey surged to a record 1.3 million arrivals in Europe. The "Jungle" camp outside Calais dominated UK front pages for months. Images of packed boats, fences, and tents were broadcast nightly into British living rooms.

These were almost entirely Syrian, Iraqi, and Afghan refugees — not EU accession workers under freedom of movement. Yet the political framing collapsed the distinction entirely. For millions of viewers, "immigration" became the Mediterranean crisis. EU freedom of movement — a 30-year-old policy governing movement between EU member states — was rhetorically fused with the refugee emergency unfolding on Greek and Turkish shores.

The key asymmetry: the refugee crisis was visible in a way that EU economic migration was not. Eastern European workers in a food processing plant in Lincolnshire were unremarkable to most British viewers. Boats crossing the Aegean were not.

The Mediterranean Crisis, 2015

These images — boats, fences, tents — dominated British television and front pages through summer and autumn 2015. They created the visual vocabulary for "immigration" that would define the referendum campaign.

Refugees arriving at Lesbos, October 2015

Refugees arriving at Lesbos — October 2015
Ggia / Wikimedia Commons CC BY-SA 4.0

Inflatable boat crossing from Turkey to Lesbos, January 2016

Boat crossing Turkey→Lesbos — January 2016
Mstyslav Chernov / Wikimedia Commons CC BY-SA 4.0

The Calais Jungle camp, 2015

The Calais "Jungle" — the image that defined the crisis in British media
Jean Revillard / Wikimedia Commons CC BY-SA 4.0

Refugees at Vienna Westbahnhof station, 5 September 2015

Refugees at Vienna Westbahnhof — 5 September 2015
Bwag / Wikimedia Commons CC BY-SA 4.0

2015 autumn

Peak Salience: Immigration Tops the Polls

By September 2015 immigration had overtaken the NHS as the single most cited concern in UK opinion polling (Ipsos Issues Index) — reaching 54 %. The chart on the right shows the full time series: immigration concern rises through the UKIP surge of 2012–14, spikes dramatically in summer 2015 with the Mediterranean crisis, and remains elevated through the referendum campaign.

Crucially, the spike has nothing to do with actual EU net migration to the UK, which remained broadly stable (and actually fell slightly) in this period. The dotted line shows net migration; the solid line shows public concern. They decouple completely in 2015. This is the confounding alternative pathway on the DAG: the EU immigration path (shown in red) represents not a genuine data correlation but a media-constructed perception.

The tabloid press ran near-daily crisis coverage. David Cameron was locked into his referendum promise. The referendum narrative was now fully formed: the EU meant uncontrolled immigration, and immigration meant the crisis on the Mediterranean.

Immigration salience vs. net migration, 2008–2025

Solid line: % citing immigration as most important issue (Ipsos Issues Index). Dashed: UK net migration (000s). Vertical markers: UKIP breakthrough 2013, Mediterranean crisis 2015, referendum 2016.

2015 May

The Election That Made Brexit Possible

The May 2015 general election is the hinge on which the entire Brexit story turns — and it is almost entirely a story about Britain's First Past the Post voting system operating in a three-plus-party environment.

UKIP won 12.6 % of the popular vote — the third-largest vote share of any party. Under a proportional system, that translates to roughly 83 MPs. Under FPTP, it translated to one seat. The votes were spread too thinly across too many marginals to win anywhere.

The vote-split mechanism: UKIP drew support from areas with high austerity exposure and depressed public services — communities that had been Conservative, Labour, or Lib Dem voters. In constituencies where the Lib Dems were defending seats, the new UKIP vote split the anti-Coalition vote, causing Lib Dem losses disproportionate to their total vote decline.

The Liberal Democrats lost 49 of their 57 seats. The Conservatives, whose support was concentrated in safer, more rural and suburban seats, gained.

David Cameron won a slim outright majority with 37 % of the popular vote — winning 331 seats vs. Labour's 232. He was now governing alone. He had made the referendum promise in January 2013 expecting another coalition, where a partner (the Lib Dems or Labour) would have blocked it. He was called on a promise he never expected to have to keep.

The causal chain suggests: austerity → UKIP surge (Panel B) → UKIP vote split in 2015 → Lib Dem wipeout → Conservative majority → referendum called. The referendum was not an inevitable product of public demand — it was a political accident created by First Past the Post.

2015: The Vote Split That Changed Everything

UKIP's 12.6% national vote produced one seat. The vote split, concentrated in austerity-hit communities, fell hardest on the Liberal Democrats. Cameron won a majority he hadn't expected.

Vote Leave sign in Belper, Derbyshire

Vote Leave sign in Belper, Derbyshire — an austerity-hit community in a marginal Lib Dem seat
Wikimedia Commons

Vote Leave hoarding in Salford

Vote Leave hoarding in Salford — a Labour heartland where UKIP had surged in 2013–14
Wikimedia Commons

2015 seats vs. votes: UKIP 12.6% → 1 seat. Lib Dems 7.9% → 8 seats (from 57). Conservatives 37% → 331 seats (majority). First Past the Post converted a three-party popular vote into a two-party outcome — and gave Cameron a majority he hadn't expected and couldn't refuse.
2016

The Referendum Campaign

Following a renegotiation of membership terms, Cameron announced the referendum for 23 June 2016. The Leave campaign's central claim — "£350 million a week for the NHS" — directly connected EU membership to the austerity of public services. It was factually misleading (the figure ignored the UK's rebate) but politically lethal: it told communities whose hospitals, libraries, and schools had been cut that EU budget contributions were the cause.

The Mediterranean refugee crisis imagery was woven into the campaign. Nigel Farage unveiled a poster showing a long line of migrants with the caption "Breaking Point." The poster deliberately conflated Syrian refugees (not EU citizens, not using freedom of movement) with EU freedom of movement. The strategy was to activate the residual fear from 2015 and redirect it toward EU membership.

The campaign images on the right show this fusion in practice: Vote Leave posters linking immigration directly to NHS funding, ground-level canvassing in austerity-hit areas, and the Leave/Remain juxtaposition on the same street.

The Referendum Campaign: NHS, Sovereignty, Immigration

The Vote Leave campaign linked EU membership directly to NHS underfunding — the £350m/week claim. It fused two grievances that austerity had created: underfunded public services and visible social change.

Vote Leave NHS poster 2016

Vote Leave poster prominently featuring the NHS claim — the strategy of linking EU budget contributions to NHS underfunding
Wikimedia Commons

Vote Leave campaign group in Warwick, May 2016

Vote Leave campaign group in Warwick, May 2016 — ground-level mobilisation in a market town with high austerity exposure
Wikimedia Commons

Leave and Remain posters side by side in Pimlico, June 2016

Leave and Remain campaign posters side by side, Pimlico, London — June 2016
Wikimedia Commons

Vote Leave poster in Omagh

Vote Leave poster in Omagh, Northern Ireland — the campaign reached every corner of the UK
Wikimedia Commons

Facebook ad archive layer

One campaign,many Brexits

The referendum campaign did not only connect austerity and immigration. On Facebook, it also turned Brexit into a variable policy object. Different voters could be shown different implied Brexits: less regulation, more protection, lower bills, more hospitals, global openness, or border panic.

The exhibit below uses real ad creatives released through the UK Parliament/DCMS inquiry, coupled with metadata on the advertisements: was Brexit actually needed to do what the ad implied?

BeLeave ride-home regulation ad Vote Leave animal welfare ad Vote Leave Turkey/Syria border ad Vote Leave NHS hospital ad
Tension 1

Control as deregulation — or control as stronger prohibition?

The same master slogan, take back control, points in opposite policy directions. In one version, control means removing EU rules from everyday life. In another, control means using sovereign power to impose tougher moral protections.

Less regulation

“The EU should not be regulating your ride home.”
deregulation “The EU should not be regulating your ride home.” BrexitCentral/BeLeave, creative 2880. Spreadsheet theme: EU controls regulations; take back control of regulations.
“Get EU regulators out of the way.”
market freedom “Get EU regulators out of the way.” BrexitCentral/BeLeave, creative 2882. Prosperity is framed as removing external regulators.
VS

More protection

“Control of our animals and their welfare?”
protective regulation “Control of our animals and their welfare?” Vote Leave, creative 2951. The text says EU law blocks a UK ban on live transport of livestock for slaughter.
“This is not okay. Stop animal abuse.”
moral enforcement “This is not okay. Stop animal abuse.” Vote Leave, creative 2971. EU payments are linked to bullfighting and animal cruelty.
Tension 2

Free-market Brexit — or worker-protection Brexit?

A second contradiction is ideological. One ad family promises a brighter, competitive Britain once EU regulators and protectionism are removed. Another says the EU acts for big business against workers, and asks people to vote Leave to protect worker rights.

The policy platform is elastic: pro-business competitiveness for one audience; anti-big-business labour protection for another.

Market liberalism

“Trade deals create jobs. But the EU won’t let us make them.”
global markets “Trade deals create jobs. But the EU won’t let us make them.” BeLeave, creative 2888. The spreadsheet frames EU protectionism as blocking key trade deals.
“We just need to get EU regulators out of the way.”
anti-regulation “We just need to get EU regulators out of the way.” BeLeave, creative 2882. A competitive future is framed as deregulation.
VS

Worker protection

“The EU acts in the interests of big business.”
anti-corporate “The EU acts in the interests of big business.” Vote Leave, creative 3042. Campaign text: the EU acts against workers.
“The EU puts pressure on unions and workers rights.”
labour rights “The EU puts pressure on unions and workers rights.” Vote Leave, creative 3043. The call-to-action is “Protect Worker Rights!”
Tension 3

Global openness — or border panic?

The campaign could sound cosmopolitan: a fair immigration system, talent from all over the globe, non-discrimination, new trade deals. But another stream used maps, arrows, Syria, Iraq and Turkey to turn EU membership into a border emergency.

The same “control” frame can mean openness to global skills or closure against a fantasised frontier threat.

Open global Britain

“A fair immigration system that doesn’t discriminate.”
global talent “A fair immigration system that doesn’t discriminate.” BeLeave, creative 2887. Campaign text: bring in talent from all over the globe.
“Welcomes people with the skills we need.”
skills system “Welcomes people with the skills we need.” DUP Vote to Leave, creative 2903. Better borders are framed as skills selection.
VS

Border threat

“Turkey has a 511 mile border with Syria.”
phantom emergency “Turkey has a 511 mile border with Syria.” Vote Leave, creative 3046. Turkey accession is made visually proximate to the UK.
“Turkey has a population of 76 million.”
border panic “Turkey has a population of 76 million.” Vote Leave, creative 3047. Demographic scale is turned into a threat cue.
False necessity

The locked door that was not locked

The deeper pattern is not only contradiction. It is false necessity: Brexit was advertised as the key to powers that were already partly or wholly available inside the EU.

This matters because the political claim was not merely “we prefer Leave.” It was often “you cannot get this outcome unless you Leave.”

🔓

Non-EU immigration

The UK already controlled immigration rules for non-EU/non-EEA nationals. Brexit was needed to end EU free movement, not to design a skills system for the rest of the world.

False necessity
🔓

Worker rights

EU labour law generally sets minimum floors. Member states could provide stronger worker protections while remaining inside the EU.

Already possible
🔓

NHS spending

The NHS was already a domestic spending choice. EU membership did not stop the UK funding hospitals, and the gross £350m/week framing was criticised as misleading.

Domestic choice
🔓

Turkey accession

EU enlargement requires unanimous approval and national ratification. As a member state, the UK already had veto power over Turkish accession.

Phantom emergency
⚠️

VAT and bills

Some EU VAT constraints were real, especially on zero-rating at the time. But the ad generalized a narrow constraint into a broad promise of lower family bills.

Exaggerated constraint
⚠️

Animal welfare

A full unilateral live-export ban was more genuinely constrained. This is better read as a contradiction with anti-regulation ads than as pure false necessity.

Mixed case
Fiscal contradiction

Lower bills — or more hospitals?

The same sovereignty dividend was implicitly allocated in different directions: lower taxes and household bills in one ad stream; new NHS capacity in another.

“Better for family budgets. Lower bills.”
tax cut “Better for family budgets. Lower bills.” DUP Vote to Leave, creative 2902. Campaign text: leaving means the UK can set its own taxes and lower bills.
“Enough to build a new NHS hospital every 7 days.”
public spending “Enough to build a new NHS hospital every 7 days.” Vote Leave, creative 3086. The £350m/week claim is converted into hospital capacity.
same imagined money → two incompatible promises
One more scroll

This just made you scroll a bit.

Almost like, well, ..., social media?

Scroll once more to return to the story
2016 Jun 23

Leave Wins — 52 %

Leave won 52 % to 48 %. The geographic map was stark. The highest Leave shares clustered in post-industrial towns of the Midlands, North East, and Wales — areas with the highest austerity exposure and, paradoxically, the lowest EU accession immigration. London, Scotland, and Northern Ireland voted strongly Remain.

The result chart (Panel E) shows the correlation directly: higher Leave vote shares are associated with larger Brexit costs as a share of GVA. The places that voted most emphatically for change have since borne the largest relative costs of the change they voted for.

52%Leave vote share nationally
75.6%Boston (highest in England)
75%+South Staffordshire, Castle Point, Thurrock

23 June 2016: The Result

Leave 52%, Remain 48%. The geographic pattern was stark: the deepest red areas coincide almost perfectly with the highest-austerity, lowest-EU-immigration areas.

EU Referendum result map — Leave (red) vs Remain (blue)

EU Referendum result map — Leave (red) vs Remain (blue). The deepest red areas correlate strongly with the highest austerity index scores.
Wikimedia Commons

Cardiff for Europe event, June 2016

Cardiff for Europe event, shortly after the result — cities and university towns that voted Remain
Wikimedia Commons

Isolated shed with Vote Leave sign

Vote Leave sign on an isolated building — the rural and small-town England that delivered the Leave majority
Wikimedia Commons

Outlier spotlight

Boston: An outlier in two dimensions

Most high-austerity areas had low EU immigration — the two narratives ran on parallel tracks without physically intersecting. Boston, Lincolnshire (highlighted in orange in the scatter plot, right) is the exception.

A market town and agricultural hub, Boston received one of the highest concentrations of Eastern European workers in England, drawn by vegetable harvesting, food processing, and logistics — particularly from Poland and Lithuania after the 2004 EU enlargement. At the same time, Boston's council budget was cut sharply under austerity. Public services visibly deteriorated: GP waiting times lengthened, school places became tight, A&E pressure rose.

The result: 75.6 % Leave — the highest in England. Boston sits in Panel C's top-right quadrant (high austerity, high immigration) yet voted Leave almost as decisively as any purely low-immigration, high-austerity place. This shows that where both factors coincided, the anger was amplified rather than attenuated. Immigration was not abstract here — it was real and visible — but the economic anxiety driving the Leave vote was still rooted in austerity, not immigration.

Panel C (right) is the confounder quadrant. Boston sits in the top-right (high austerity, high immigration), annotated in orange. Its Leave vote defies the simple "high immigration = Leave" narrative — it shows that austerity was the necessary condition, and immigration (where visible) was the available proximate cause.

C. Austerity × EU Immigration — the confounder quadrant

Austerity index (x) vs EU accession migrant growth 2001–11 (y). Quadrant shading = mean Brexit gap per cell. Orange ring = Boston (E07000136), highest Leave vote in England.

2016 Jun–Jul

Boston in the Media: The Exception Became the Rule

After the referendum result, Boston became the most-cited symbol of the Leave vote in national media coverage. BBC News, Sky News, and Channel 4 all ran features in the town in the days after the result. Interviews with Boston Leave voters were broadcast nationally and interpreted as representative of why Britain voted Leave.

The problem: Boston was the exception, not the rule. Its combination of high EU immigration and high Leave vote was unique precisely because its EU immigration was so visible. The majority of high-Leave areas had very little EU immigration. The immigration narrative — compelling and vivid in Boston — was being generalised to explain a phenomenon that, everywhere else, had almost nothing to do with immigration.

This media amplification locked in the incorrect causal narrative: "people voted Leave because of immigration." It crowded out the more accurate and more troubling story: "people voted Leave because a decade of austerity had left them with a legitimate grievance, and the campaign gave them immigration as the explanation."

The distinction matters enormously for policy. The "immigration caused Brexit" narrative implies that restricting immigration would have prevented it or would satisfy the underlying grievances. The "austerity caused Brexit" narrative implies that the underlying grievances remain intact — and have since been compounded by Brexit's own economic costs.

But even the word "austerity" can mislead, if it conjures only Treasury spreadsheets and GDP charts. The actual experience of the grievance was granular and daily. Middle England cities and towns were asking — not rhetorically, but in the ordinary course of life — why their local bus route had been cancelled. Why the swimming pool had been sold off, rebranded, and now cost twice as much to enter. Why the planning portal crashed every time you submitted an application. Why it took forty-five minutes on hold to speak to the council about a missed bin collection. Why Transport for London — with its Oyster card, its real-time apps, its frequent and comprehensible network — felt like a piece of infrastructure from a different country, available only to the people who happened to live where the money was.

This was not abstract. These were the touchpoints through which the state made itself legible — or stopped doing so. The decade after 2010 was the decade in which local government quietly stopped being something people encountered as a functioning service and became something they encountered as an absence: a closed library, a defunded youth centre, a website that told you to call a number that put you on hold. The grievance that Brexit crystallised was partly about trade exposure and public spending aggregates, but it was also about this: the daily experience of a state that had retreated, and left nothing in its place.

The relevant Brexit voter is not only the agricultural worker in Boston competing with EU labour. It is also the resident of a medium-sized English town watching the leisure centre close, the bus timetable shrink, and the council website fail — and being told, by a campaign with a red bus and a large number, that the explanation and the remedy were both the same thing: leaving the European Union.

The Leave Vote in Rural and Small-Town England

Boston's story — high immigration, high austerity, highest Leave vote — became the face of Brexit in national media. But most Vote Leave communities looked like this: small towns with visible decline and very little EU immigration.

Vote Leave sign in Belper

Vote Leave sign in Belper, Derbyshire. Belper is in an area with average EU immigration but high austerity exposure — more representative than Boston of the typical Leave community.
Wikimedia Commons

Will Brexit ever mean Brexit — Northumberland coastline

"Will Brexit ever mean Brexit?" — a question painted on a coastal wall in Northumberland, a region with high austerity and low EU immigration
Wikimedia Commons

2017 June

The Election That Hardened Brexit

Theresa May called a snap election in April 2017, expecting to convert her slim inherited majority into a commanding mandate for Brexit negotiations. The UKIP coalition that had reshaped British politics in 2013–15 had now served its purpose — the referendum had been won — and its voters were looking for a new home.

The UKIP vote collapsed from 12.6 % in 2015 to 1.8 % in 2017. Where did those votes go? The redistribution was uneven and — for May — fatal. In Leave-voting Labour heartlands, a substantial portion went to Labour under Jeremy Corbyn, who ran a genuinely radical domestic programme that addressed the economic anxiety underlying the UKIP vote. In more Conservative-leaning areas, UKIP votes went to the Conservatives. But the net seat effect was devastating.

The FPTP paradox, second edition: Labour's gains concentrated in urban seats already safely Labour. Conservative gains in traditional seats were insufficient to offset unexpected losses in university towns and some northern constituencies where Corbyn mobilised younger voters and former UKIP supporters simultaneously. The Conservatives lost 13 seats. Their majority evaporated.

May needed to form a minority government with a confidence-and-supply deal with the Democratic Unionist Party (DUP). This arrangement, combined with the paper-thin majority, meant that a bloc of 28–35 hardline Conservative Eurosceptics — the European Research Group (ERG) — now held genuine veto power.

2017: UKIP Collapses, Parliament Hangs

UKIP's vote fell from 12.6% to 1.8%. The redistribution left May without a majority. An anti-Brexit protest in Edinburgh, March 2017 — weeks before May called the snap election.

Brexit protest outside Holyrood, Edinburgh 2017

Brexit protest outside Holyrood, Edinburgh — March 2017. Scotland voted 62% Remain; opposition to Brexit was the defining political force.
Wikimedia Commons

Leave Means Leave bus outside Parliament, 2018

"Leave Means Leave" campaign bus outside Parliament, December 2018 — ERG-aligned activists maintaining pressure for the hardest possible Brexit as May's deal faced its first defeat
Wikimedia Commons

2017 result vs expectation: May called the election with a 20-point poll lead. She finished with a 2-point lead, losing 13 seats, losing her majority. UKIP's 10.8pp drop redistributed partly to Labour (+9.6pp), partly to Conservatives (+5.5pp) — but the seat geography favoured neither side.
2017–2019

Parliamentary Deadlock: May's Trap

May was caught in an impossible trap. The DUP would not accept any arrangement that created a regulatory or customs divergence between Northern Ireland and the rest of the UK — this meant the Irish backstop was politically untenable. The ERG would not accept any arrangement that kept the UK bound by EU customs or regulatory rules — this meant a Norway-style soft Brexit was equally untenable.

May's withdrawal agreement was rejected by parliament three times — by margins of 230, 149, and 58 votes — the largest legislative defeats in modern British history. Each rejection hardened the political reality: only the most maximal Brexit was politically viable for the parliamentary arithmetic.

Boris Johnson's solution — accept the Northern Ireland Protocol (a de facto customs border in the Irish Sea, separating Northern Ireland from Great Britain in regulatory terms) and call it "getting Brexit done" — was only possible after securing his own 80-seat majority in December 2019. The hard Brexit that resulted was not the inevitable consequence of the 52–48 referendum result. It was the product of two FPTP electoral accidents, a minority government, and a constitutional veto by a small parliamentary bloc.

Parliament vs. Brexit: The Constitutional Crisis

May's deal was defeated three times. The People's Vote campaign mobilised millions. Boris Johnson's December 2019 majority finally broke the deadlock.

Brexit vote in Parliament, 15 January 2019

Outside Parliament on 15 January 2019, the night May's deal was rejected by 230 votes — the largest parliamentary defeat of a government in modern British history
Wikimedia Commons

People's Vote march in Parliament Square

People's Vote march in Parliament Square — one of the largest political demonstrations in British history, calling for a second referendum
Wikimedia Commons

People's Vote march — NHS vs Brexit banner

"NHS vs Brexit" — the People's Vote march reframed the debate: was Brexit worth the cost to public services?
Wikimedia Commons

Anti-Brexit campaigners at Westminster

Anti-Brexit campaigners at Westminster, 2018 — the parliamentary impasse created space for sustained public mobilisation
Wikimedia Commons

2019 December

FPTP Round Three: The Brexit Party Gambit

Nigel Farage's answer to the parliamentary deadlock was to found yet another party. The Brexit Party — launched in February 2019 — won 29 seats in the European Parliament elections just months later, becoming the UK's largest party in Brussels. It was a national brand built almost entirely through social media, requiring no prior organisational infrastructure: the internet had solved the collective action problem that historically made single-issue parties impossible under FPTP.

When Boris Johnson called a general election for December 2019, Farage faced the classic FPTP dilemma: field candidates everywhere and split the Leave vote, handing seats to Remain-aligned parties; or deploy strategically. He chose deployment. The Brexit Party stood down in all 317 Conservative-held seats, removing any risk to incumbent Tories. But they kept candidates in Labour-held seats — specifically in Leave-voting Labour heartlands across the Midlands, the North, and Wales.

The FPTP arithmetic, third edition: In marginal Labour seats in heavily Leave-voting areas, a Brexit Party vote of 5–8% was enough to drag Labour below the winning threshold. The Conservatives gained 47 seats from Labour — on swings that were, in many constituencies, smaller than the Brexit Party's local vote share. Without the Brexit Party's selective presence in those seats, the mathematics would not have delivered Johnson his majority.

The mechanism was the same as 2013–2015, but now operating in reverse: instead of using FPTP to punish Conservatives into holding a referendum, Farage was using it to reward Conservatives who would deliver the hardest Brexit. A nationally-branded, socially-networked, single-issue candidacy — requiring no deep local organisation, just enough presence to move the marginal vote — had become the decisive instrument of British constitutional change for the third time in six years.

Johnson's 80-seat majority ended three years of parliamentary paralysis. But it was not a majority built on a surge of Conservative support — the Conservative vote share rose by only 1.2 percentage points from 2017. It was a majority built on the systematic exploitation of FPTP's core vulnerability: that a nationally coordinated signal, delivered through social media at near-zero cost, can convert a modest national vote share into a decisive seat advantage by concentrating the effect in the marginals that decide governments.

2019–2020

Brexit Negotiations and the Shape of Departure

The UK-EU Trade and Cooperation Agreement (TCA), concluded on 24 December 2020, was the thinnest possible deal: zero tariffs and zero quotas on goods, but no mutual recognition of services, no equivalence for financial services, no freedom of movement, and comprehensive non-tariff barriers from rules-of-origin requirements, customs declarations, and regulatory divergence.

For the UK's service-dominated economy (80 % of GDP) the deal offered almost nothing. For manufacturing supply chains deeply integrated with EU production, it imposed new frictions immediately. For regions whose economies depended on EU-linked services exports — financial services in London, professional services in Edinburgh, creative industries in Manchester — the non-tariff frictions proved more costly than the headline zero-tariff commitment suggested.

The TCA was, by design, the outcome of a process shaped by the ERG's veto power and the Johnson government's political priorities. A softer Brexit — closer to Norway's EEA relationship, with regulatory alignment and freedom of movement — would have been less economically costly but was politically impossible given the parliamentary arithmetic that FPTP had created.

Northern Ireland: constitutional friction cushioned with cash

The Johnson settlement also sits inside a wider fiscal story: Northern Ireland was repeatedly stabilised with exceptional UK Government funding as Brexit exposed the unresolved problem of keeping an open Irish border while taking Great Britain out of the EU's customs and regulatory order.

  • 2017 — May, not Johnson: the DUP–Conservative confidence-and-supply deal supported Theresa May's minority government and came with an additional £1 billion over five years for Northern Ireland, including infrastructure, health, broadband, education pressures, deprivation and mental health.
  • January 2020 — Johnson's New Decade, New Approach: Johnson's government committed around £2 billion to support the restored Northern Ireland Executive and public services.
  • December 2020 — post-transition implementation: the UK announced a further £400 million Northern Ireland package, on top of £650 million already announced for trader support, technology and PEACE Plus contributions.

Sources: House of Commons Library, confidence-and-supply £1bn; UK Government, £400m post-transition package.

Brexit Negotiations and the Shape of Departure

Johnson's "Get Brexit Done" election majority in December 2019 ended the parliamentary stalemate. The Trade and Cooperation Agreement, concluded on 24 December 2020, was the thinnest possible deal; in Northern Ireland, the constitutional friction was accompanied by substantial UK fiscal support.

Boris Johnson Get Brexit Done campaign, 2019

Boris Johnson's "Get Brexit Done" campaign. His 80-seat majority in December 2019 ended three years of parliamentary paralysis — and locked in the hardest available Brexit.
Wikimedia Commons

HM Government Get Ready for Brexit campaign

HM Government "Get Ready for Brexit" campaign — October 2019. The £100m public information campaign was a measure of how unprepared businesses and individuals were for the practical consequences.
Wikimedia Commons

Brexit Day flag, Sandy Lane, Norwich, 31 January 2020

Union Jack flown in Sandy Lane, Norwich on Brexit Day — 31 January 2020. The UK formally left the EU. The transition period ended 31 December 2020.
Wikimedia Commons

Post-Brexit blues, European Parliament

UK MEPs leaving the European Parliament after the final plenary session, January 2020
Wikimedia Commons

2016 – present

The Reckoning: Leave → Cost

Synthetic control method (SCM) counterfactual estimates show substantial cumulative GVA losses, largest as a share of regional income in the most deprived areas — those that voted most heavily for Leave. The chart on the right (Panel E) shows this directly: Leave vote share on the x-axis, Brexit cost on the y.

The "levelling up" promise became a levelling down reality. The communities that were told Brexit would redirect money from Brussels to their public services have instead seen a decade of austerity compounded by a decade of post-Brexit underperformance. The cumulative gap between UK performance and the synthetic control counterfactual continues to widen.

The full causal chain is now visible and evidenced. Austerity created the anger. The Mediterranean crisis provided the imagery. FPTP in 2015 created the referendum. FPTP in 2017 hardened its outcome. The Brexit Party in 2019 locked it in. The communities that voted most emphatically for change got the least of it.

Brexit has reduced the economic pie for the country as a whole. It has reduced the fiscal space and reduced the ability to level up. In relative terms, the Brexit-voting regions may feel vindicated — but on average, the country as a whole is poorer. The end result: more disgruntlement and more instability.

This matters beyond Britain's borders. Russia's war in Europe, aggression from the US under Donald Trump, an assertive China, and the accelerating climate crisis make it all too transparent that shared challenges are best tackled as a team. The Brexit experiment has made that lesson more costly to learn.

E. Leave vote → Brexit cost

Leave vote share % (x) vs Brexit cost as % GVA (y, positive = more loss). Each bubble = a local authority; size ∝ √GVA 2016; colour = Brexit gap (red = larger loss). The upward slope is the central finding: those who voted most for Leave have paid most.

South West / ITL1 TLK

What happened since Brexit?

Context and local drivers for South West.

South West
What happened since Brexit?

South West

Openness to trade and Brexit

To assess the economic impact on South West, a first natural consideration is the extent to which the region may have been impacted owing to its openness to trade. We compute the cumulative losses post 2016, also in a version excluding the pandemic years of 2020 and 2021, and plot the relative output loss relative to 2016 GVA against a measure of local trade openness based on subnational trade data first published in 2019.

Trade openness and Brexit's estimated economic cost

Why start here

To assess the economic impact on South West, a first natural consideration is the extent to which the region may have been impacted owing to its openess to trade. We compute the cumulative losses post 2016, also in a version excluding the pandemic years of 2020 and 2021, and plot the relative output loss relative to 2016 GVA against a measure of local trade openess based on subnational trade data first published in 2019.

We see that, on average, regions with more trade exposure exhibit higher output losses. As we move to more granular regional definitions, owing to measurement noise, the correlations do get weaker, but the pattern suggests that trade openess is not unrelated to the size of the output loss.

We see that, on average, regions with more trade exposure exhibit higher output losses. As we move to more granular regional definitions, owing to measurement noise, the correlations do get weaker, but the pattern suggests that trade openness is not unrelated to the size of the output loss.

This is not unexpected: Brexit is, what economists call, a terms-of-trade shock — it created frictions in the UK’s most significant trade relationship. The European single market, in which the UK was a member until the start of 2020, had effectively removed barriers to trade.

Brexit reimposed many of these barriers which, as a result, drove up the cost of trade. This is particularly consequential for the many value chains that criss-cross the European continent.

Changes to trade in South West

A key promise of Brexit was for the UK to regain its ability to negotiate trade deals with other, potentially faster growing countries or regions. Further, there is and was hope that trade in the future may be much more shaped by services—not goods—trade. We do see that, on average, the UK’s trade in services has grown.

How did South West trade evolve since Brexit?

From 2019 to 2023, total trade in the South West rose markedly, with gains across all four channels and especially strong growth in services and in non-EU services in particular.

Total trade increased from £67.4bn in 2019 to £84.6bn in 2023, a rise of £17.2bn or about 25.6%, so the overall pattern is clearly one of expansion rather than decline. Exports rose by £10.3bn and imports by £6.9bn over the same period. Looking at the trade channels in the waterfall inputs, EU goods trade increased from £19.5bn to £25.3bn, a gain of £5.7bn; non-EU goods trade rose from £27.2bn to £30.2bn, up £3.1bn; EU services trade rose from £8.8bn to £10.8bn, up £2.0bn; and non-EU services trade climbed from £11.9bn to £18.5bn, up £6.6bn. That means the largest single contributor to overall trade growth was non-EU services, followed by EU goods, with all channels contributing positively. This looks mixed overall, but with a noticeable services-led and non-EU-facing element. Goods trade still grew strongly in cash terms, and EU goods growth was particularly pronounced, but services grew faster than goods overall, and within services the shift was clearly toward non-EU markets. The EU share of total trade changed little overall, edging up only slightly, which suggests no simple story of wholesale reorientation away from Europe; instead, the pattern appears to combine stronger EU goods trade with faster non-EU services growth. The South West’s standout sectors include accommodation and food services, agriculture, forestry and fishing, and manufacturing, which may help explain why both goods and services channels matter here rather than only one side of trade. This stronger nominal trade performance sits somewhat uneasily alongside the estimated Brexit effect in the synthesis, which points to a persistent negative real GVA gap by 2023 relative to a synthetic comparison. Taken together, that suggests rising trade values did not necessarily translate into equally strong real output performance. The difference may reflect factors such as inflation, exchange-rate movements, pandemic recovery effects between 2019 and 2023, commodity and input-price changes, and sector-specific shocks that lift nominal trade values without implying stronger real activity. Those caveats matter here, especially because the trade figures are in current values while the headline GVA comparison is framed in real terms.

📦EU vs non-EU trade growth, 2019–2023

How EU and non-EU goods & services trade evolved relative to 2016 GVA — x-axis: EU trade growth, y-axis: non-EU trade growth. Regions above the diagonal diversified away from the EU.

Bubbles:All regionssize ∝ √GVA 2016

Immigration and Brexit

Immigration is another important dimension around Brexit. In the run up to the EU referendum, many populist UK politicians adopted an explicit anti-immigration narrative. The promise to voters was that once the UK is outside of the European Union, there would be no more freedom of movement. The UK would take control over its national borders and, so the implicit understanding may have been, reducing the influx of immigration.

The contrary has happened. The UK has seen an unprecedented increase in immigration post 2020 with net international migration peaking at 944,000, being nearly three times the previous record. The UK’s new immigration scheme, which the UK could have adopted even before Brexit, is often credited for this sharp increase.

At the same time, there was significant domestic migration and displacement. Areas in the UK with significant internal net migration are typically not the places that receive significant international migrants. While the underlying causal factors may be manifold, this clearly can set up sharp anti-immigration narratives if domestic migrants perceive displacement from international migrants.

✈️Internal vs international net migration (post-2021)

Net internal displacement (x) vs net international arrivals per capita (y). Regions in the top-left gained international migrants while losing residents internally.

Bubbles:All regionssize ∝ √GVA 2016

How was South West affected by immigration since Brexit?

Migration appears large enough to matter in the South West, with especially strong net gains after 2016 and a substantial share of that change occurring after 2020, so it could have cushioned some local Brexit-related weakness without establishing a causal offset.

The estimated Brexit effect for the South West is negative on the main output measure, with real GVA materially below its synthetic comparison by 2023. Against that backdrop, migration looks large enough to matter locally as contextual evidence. Since 2016, net total migration was about 436,004, around 7.9% of the 2016 population, and this area ranked at the top of its England-excluding-London reference group and among the highest UK ITL1 areas on net total migration. The pattern is mixed rather than purely international: net international migration since 2016 was about 158,570, while net internal migration was larger at about 277,434, suggesting both overseas inflows and moves from elsewhere in the UK help condition the interpretation. A substantial part of the migration change appears concentrated after 2020. Around 87.8% of the post-2016 net international migration change and about half of the internal migration measures are accounted for in the post-2020 period, with post-2020 net total migration still amounting to roughly 4.9% of the 2020 population. That is consistent with migration having potentially buffered some Brexit-related weakness through labour supply, local consumer demand, housing demand, pressure on services, and possibly the local tax base or fiscal capacity. The labour market context is also consistent with some absorptive capacity, since economic inactivity was slightly lower in 2024 than in 2016. But this does not establish that migration causally offset the Brexit effect: migration is only contextual here, and the same inflows that could have supported labour supply and demand may also have complicated pressures on housing and public services while the negative GVA gap persisted.

South West / ITL1 TLK

Robustness

Testing whether the divergence is robust to donor-pool choice, treatment window, and placebo comparison.

Metric
Treatment window

Sensitivity to donor-pool choice

Observed levels against alternative donor-pool synthetic fits.

Observed level against all candidate synthetic paths, shown from 2005 onward.
Each point is a donor-pool specification. Lower pre-treatment RMSPE is better; more negative post-treatment average gap implies a larger shortfall.

How to read donor-pool sensitivity

The left chart asks whether the observed path remains separated from a wide range of plausible synthetic benchmarks when the donor pool changes. The dropdown highlights one donor-pool family at a time, while the full set of grey lines shows the total design space tested.

The scatter plot summarises the same candidate set in two dimensions: pre-treatment fit on the x-axis and average post-treatment percentage gap on the y-axis. If highlighted donor pools cluster in the lower part of the chart while still fitting well before treatment, the result is less likely to be driven by a single arbitrary donor-pool choice.

Placebo-fits for significant donors

True placebo gap paths and their distribution from the robustness exports.

Gap paths on the SCM estimation scale for placebo units that pass the robustness filter, alongside the treated unit.
Distribution of placebo robustness statistics with the treated unit marked for reference.

How to read the placebo comparison

The placebo exercise carries out fake Brexit experiments in a donor universe and compares how, within this donor universe, the UK synthetic control would evolve relative to the synthetic-control estimate for the fake Brexit. Since we are constructing a large set of synthetic-control estimates, 31 for each potential donor-pool set configuration and different spatial granularities, doing this for all would be computationally infeasible.

Rather, we construct a restricted candidate set of potentially informative placebos that pertain to donors that are active donors across these donor-pool configurations. In these restricted placebo runs, an active donor does not simply mean a place that received a large synthetic-control weight in one model. It means a place that looked relevant to the counterfactual construction under a broader set of rules, including repeated appearance across admissible donor-pool specifications and support-based placebo diagnostics. The restricted donor universe should therefore be understood as a support-informed subset of plausible comparison places, not just the set of donors with visibly large weights in a single best-fitting specification.

Placebo-weighted fit. The pre-Brexit placebo-weighted fit uses a fake treatment date before the referendum, here a post-2012 placebo, to evaluate how well different synthetic-control specifications behave when no Brexit effect should yet be present. We take the same candidate donor-pool models that could later be used for the real post-2016 or post-2020 analysis and ask which specifications produce the smallest spurious gaps over the following pre-Brexit years when no such difference should arise. Those placebo-period errors are then turned into weights, so specifications that generate smaller false effects in the pre-Brexit placebo window receive more weight in the final ensemble.