Politics & media · Brexit: what changed

What was promised, and what happened

Both campaigns, same treatment. Including the failed Remain predictions that are usually left out.

View shareable visual summariesBrexit sectionLeave claimsRemain claims

Five rules this database follows

  1. 1

    Both sides, same treatment

    A database of embarrassing Leave quotes is a campaign leaflet. Remain made specific, dated, falsifiable predictions too, and some failed badly.

  2. 2

    The claim as made, not as remembered

    Recorded in the wording actually used. The bus did not say “we will spend £350m a week on the NHS”, and the difference is the whole argument.

  3. 3

    “Not yet measurable” is a real verdict

    A prediction with a 2030 horizon cannot be marked wrong in 2026. Forcing every claim into right or wrong would be the fastest way to make this dishonest.

  4. 4

    Some claims were never testable

    “Britain will thrive outside the EU” has no failure condition. It is recorded and labelled, not scored, because scoring it would be scoring a mood.

  5. 5

    Counterfactuals are flagged

    Where a verdict depends on comparing with a world that did not happen, the entry carries a counterfactual marker rather than pretending the comparison was observed.

What each verdict means

  • SupportedThe thing claimed has happened, on the measure the claim itself used.
  • Partly supportedPart of the claim holds and part does not, or it holds on one measure and not another.
  • Not supportedThe thing claimed has not happened, measured as the claim framed it.
  • Not yet measurableThe horizon has not arrived, or no measurement of the right thing exists yet.
  • Not falsifiableThe claim has no condition under which it could be shown wrong. Recorded, not scored.

Where the claims land

Leave claims (8)

  • Supported1
  • Partly supported3
  • Not supported3
  • Not falsifiable1

Remain claims (8)

  • Supported3
  • Partly supported1
  • Not supported3
  • Not yet measurable1

Do not read these as a score. This is a selection, not a census. It covers the campaign propositions that were most prominent in the coverage, most specific, or most often cited since — and prominence is a judgement. It is not a scoreboard: counting verdicts and declaring a winner would treat "Turkey is joining the EU" and "sterling will fall 12%" as equal units, which they are not. Read the entries, not the totals.

Leave campaign claims

LeaveEU budgetPartly supported
“We send the EU £350 million a week — let’s fund our NHS instead.”

Vote Leave (the designated lead campaign) · Throughout the campaign, April–June 2016

Source of the claim: Vote Leave campaign bus and campaign literature; recorded in KCL’s content analysis, which found the £350m argument in 147 articles and the NHS version of it in 77 ↗

What happened

The £350m figure was the UK’s gross theoretical contribution before the rebate, which was deducted before any money was sent, and before EU spending in the UK. The UK Statistics Authority publicly criticised its continued use as misleading. The UK did stop paying contributions, and NHS England funding did subsequently rise substantially — but the 2018 announcement of £20.5bn a year more for the NHS was funded by tax and borrowing, and the IFS found there was no Brexit dividend available to pay for it.

Source: UK Statistics Authority correspondence; Institute for Fiscal Studies analysis of the 2018 NHS funding settlement

The honest caveat. The wording is doing a lot of work. "We send" was not true of £350m; "let’s fund our NHS instead" was a suggestion, not a pledge, and Vote Leave was not a government able to make one. Both the claim that it was a lie and the claim that it was honestly delivered overstate their case.

Partly supported: Part of the claim holds and part does not, or it holds on one measure and not another.

LeaveTradeSupported
Outside the EU the UK would be free to negotiate its own trade agreements with the rest of the world.

Vote Leave · 2016

Source of the claim: Vote Leave campaign material

What happened

Unambiguously delivered as a matter of legal capability. The UK has an independent trade policy, has signed new agreements including with Australia and New Zealand, and acceded to the CPTPP. Whether those agreements have produced net economic benefit against the previous arrangements is a separate question with a much less favourable answer.

Source: Department for Business and Trade, UK trade agreements ↗

The honest caveat. Capability and benefit are different claims. This claim was about capability, and on that basis it holds.

Supported: The thing claimed has happened, on the measure the claim itself used.

LeaveImmigrationPartly supported
“Take back control of our borders” — ending free movement so that Britain decides who comes.

Vote Leave · 2016

Source of the claim: Vote Leave campaign material; the campaign’s central slogan

What happened

Free movement ended and the UK now sets its own rules for EU and non-EU migration alike — the control claim is straightforwardly met. But control was widely understood as meaning lower numbers, and net migration rose to a record after the new system began, peaking at around 900,000 in the year to June 2023 before falling to 171,000 in the year to December 2025. EU net migration is now negative; non-EU net migration is several times its pre-Brexit level.

Source: ONS, Long-term international migration, provisional: year ending December 2025 (published 21 May 2026) ↗

The honest caveat. The gap between the two readings is the whole immigration argument after Brexit. Control was delivered and used to admit more people, not fewer — a policy choice by successive governments, not a failure of the mechanism.

Partly supported: Part of the claim holds and part does not, or it holds on one measure and not another.

LeaveImmigrationNot supported
“Turkey (population 76 million) is joining the EU” — with the implication of free movement rights for Turkish citizens.

Vote Leave poster campaign · May–June 2016

Source of the claim: Vote Leave poster and campaign material

What happened

Turkey has not joined the EU. Accession negotiations, formally opened in 2005, were effectively frozen by 2018 and remain so. No date for Turkish accession existed in 2016 and none exists now.

Source: European Commission enlargement policy

Not supported: The thing claimed has not happened, measured as the claim framed it.

LeaveEconomyNot supported
“There will be no downside to Brexit, only a considerable upside.”

David Davis MP, later Secretary of State for Exiting the European Union · 2016

Source of the claim: Public remarks during and after the campaign

What happened

Stated as an absolute — no downside at all — it is contradicted by the government’s own subsequent forecaster. The OBR assumes the post-Brexit trading relationship reduces long-run productivity by 4% relative to remaining. Whatever the upsides, "no downside" is not a description of the official position.

Source: Office for Budget Responsibility, Brexit analysis ↗

Not supported: The thing claimed has not happened, measured as the claim framed it.

LeaveTradeNot supported
A UK–EU deal could be negotiated quickly and easily, because the UK held the stronger hand.

Multiple Leave campaigners, including Michael Gove’s “we hold all the cards” · 2016

Source of the claim: Campaign speeches and interviews

What happened

Four and a half years elapsed between the referendum and the Trade and Cooperation Agreement taking effect. In between: two extensions to Article 50, three parliamentary defeats of the Withdrawal Agreement, two changes of Prime Minister and a general election. The Northern Ireland arrangements then required renegotiation in 2023.

Source: Trade and Cooperation Agreement, in force 1 January 2021; Windsor Framework, February 2023

Not supported: The thing claimed has not happened, measured as the claim framed it.

LeaveTradePartly supported
Leaving the Common Fisheries Policy would return control of UK waters and benefit the UK fishing industry.

Vote Leave and fishing industry campaigners · 2016

Source of the claim: Campaign material

What happened

The UK left the Common Fisheries Policy and now negotiates annual quotas as an independent coastal state, with a phased increase in UK quota shares under the TCA. But EU vessels retained substantial access during the adjustment period, the quota gains were far smaller than the industry had campaigned for, and exporters gained new certification and border costs on a trade that goes overwhelmingly to the EU.

Source: Trade and Cooperation Agreement fisheries provisions; Defra fisheries management plans ↗

The honest caveat. Fisheries is the clearest case on this page of legal control increasing while commercial position did not improve — and of how little the two need have to do with each other.

Partly supported: Part of the claim holds and part does not, or it holds on one measure and not another.

LeaveEconomyNot falsifiable
Britain will “prosper” and “thrive” outside the European Union.

Multiple Leave campaigners — recorded by KCL as appearing in 150 articles · 2016

Source of the claim: KCL content analysis, Table 8 ↗

What happened

No threshold was attached, so no outcome could disconfirm it. Recorded here because it was one of the most frequently made economic arguments of the campaign, and because unfalsifiable claims doing heavy campaign work is itself a finding.

Source: Not applicable

Not falsifiable: The claim has no condition under which it could be shown wrong. Recorded, not scored.

Remain campaign claims

This half of the page is the one usually missing. The Treasury’s immediate-impact analysis predicted a recession and 500,000 job losses that did not happen, and the damage that did to the credibility of official economic forecasting is still being paid for in every argument about the OBR’s current estimates.

RemainEconomyNot supported
A vote to leave would tip the UK into a year-long recession, with around 500,000 jobs lost and GDP around 3.6% lower after two years, in the Treasury’s “shock” scenario.

HM Treasury, under Chancellor George Osborne · 23 May 2016

Source of the claim: HM Treasury analysis: the immediate economic impact of leaving the EU (Cm 9292) ↗

What happened

No recession followed the vote. The UK economy continued to grow through 2016, 2017 and 2018, and unemployment fell to its lowest level since the mid-1970s. This is the clearest failed prediction of the campaign on either side, and it did lasting damage to the credibility of official economic forecasting in exactly the way its critics said it would.

Source: ONS national accounts and labour market statistics, 2016–2018

The honest caveat. In fairness to the analysis: it modelled an immediate Article 50 notification and a rapid transition, neither of which happened, and the Bank of England cut rates in August 2016 partly to offset the shock. But the prediction was made without those conditions attached, and it was wrong as made.

Not supported: The thing claimed has not happened, measured as the claim framed it.

RemainEconomy CounterfactualNot yet measurable
Leaving the EU would leave UK households £4,300 a year worse off by 2030.

HM Treasury, under Chancellor George Osborne · 18 April 2016

Source of the claim: HM Treasury analysis: the long-term economic impact of EU membership and the alternatives. KCL recorded it in 365 articles — more coverage than the £350m claim received ↗

What happened

The stated horizon is 2030, which has not arrived. The direction of the underlying estimate is broadly consistent with the OBR’s current assumption of a 4% long-run productivity reduction, but the two are different models measuring different things over different periods.

Source: OBR Brexit analysis, updated 20 July 2026 ↗

The honest caveat. The presentation was criticised at the time and the criticism was fair: the figure was GDP loss divided by number of households, which is not the same as households being £4,300 poorer in their own pockets. A defensible number was framed in an indefensible way.

Not yet measurable: The horizon has not arrived, or no measurement of the right thing exists yet.

RemainEconomySupported
Sterling would fall sharply — by around 12% in the Treasury’s shock scenario.

HM Treasury; also warned by the Bank of England · 23 May 2016

Source of the claim: HM Treasury analysis: the immediate economic impact of leaving the EU

What happened

Sterling fell around 10% on a trade-weighted basis in the days after the vote and has not returned to its pre-referendum level in the decade since. The resulting rise in import prices contributed to the 2017 inflation squeeze on real wages.

Source: Bank of England effective exchange rate index

Supported: The thing claimed has happened, on the measure the claim itself used.

RemainEconomyNot supported
An emergency budget would be needed within weeks of a Leave vote, raising taxes and cutting spending.

George Osborne, Chancellor of the Exchequer · 15 June 2016

Source of the claim: Public statements during the campaign

What happened

No emergency budget was held. Osborne left office in July 2016 and his successor abandoned the fiscal targets rather than tightening. The claim is notable because it was widely reported at the time as scaremongering, and on this occasion the accusation was correct.

Source: HM Treasury; no emergency budget was delivered in 2016

Not supported: The thing claimed has not happened, measured as the claim framed it.

RemainTrade CounterfactualSupported
Leaving the single market and customs union would create new barriers and reduce UK–EU trade.

Remain campaign, HM Treasury, and a broad range of economic institutions · 2016

Source of the claim: Campaign material and official analysis

What happened

UK goods exports to the EU in 2025 were 14% below their 2019 level in real terms. Customs declarations, rules-of-origin requirements and sanitary and phytosanitary checks now apply. The OBR continues to assume a 15% long-run reduction in overall trade intensity.

Source: House of Commons Library, Statistics on UK trade with the EU; OBR Brexit analysis ↗

The honest caveat. Exports to non-EU countries were also 8% below 2019, so not all of the goods weakness is Brexit — the pandemic, energy prices and global supply chains all fall in the same window. UK services exports to the EU, by contrast, were 28% above their 2019 level.

Supported: The thing claimed has happened, on the measure the claim itself used.

RemainNorthern IrelandSupported
Leaving would create serious problems for the Irish border and the Good Friday Agreement settlement.

Remain campaigners, including former Prime Ministers John Major and Tony Blair · 2016

Source of the claim: Campaign speeches, June 2016

What happened

The Irish border was the central obstacle to the Withdrawal Agreement and caused its rejection three times. It produced the Northern Ireland Protocol, a trade border in the Irish Sea, the collapse of power-sharing at Stormont for two years, and a renegotiation in the form of the Windsor Framework in 2023.

Source: Windsor Framework; Northern Ireland Assembly restoration, February 2024 ↗

Supported: The thing claimed has happened, on the measure the claim itself used.

RemainEconomy CounterfactualPartly supported
Business investment would be damaged by uncertainty and reduced market access.

Remain campaign and multiple economic institutions · 2016

Source of the claim: Campaign material and official analysis

What happened

Business investment stagnated between the referendum and the pandemic, in a period when it was growing in comparable economies, and the OBR judges that around two-fifths of its estimated 4% productivity effect had already occurred before the TCA even came into force — through uncertainty weighing on investment. Investment has since recovered and grew 1.7% in the second quarter of 2026.

Source: ONS Business investment, Q2 2026 (published 13 August 2026); OBR Brexit analysis ↗

Partly supported: Part of the claim holds and part does not, or it holds on one measure and not another.

RemainEconomyNot supported
Brexit would reduce house prices — in the Treasury’s shock scenario, by around 10%.

HM Treasury; recorded by KCL as an argument appearing in 216 articles · May 2016

Source of the claim: HM Treasury analysis: the immediate economic impact of leaving the EU

What happened

UK house prices did not fall after the referendum. They continued rising through 2016–2022, and the subsequent softening was driven by interest rates rather than by EU exit.

Source: ONS/HM Land Registry UK House Price Index

The honest caveat. Worth noting because it was framed as a warning, and to many readers a 10% fall in house prices would have sounded like a promise.

Not supported: The thing claimed has not happened, measured as the claim framed it.

How these claims were selected

Claims were selected where three conditions held: the claim was made by a designated campaign, a government department or a senior named figure; it was recorded in a citable contemporaneous source; and it was specific enough that some evidence could bear on it. Claims meeting the first two but not the third are included and marked "not falsifiable" rather than dropped, because leaving them out would flatter both campaigns.

This page follows the same editorial rules as the site’s fact-check methodology: verdicts are never silently revised, and where a figure is disputed the dispute is shown rather than resolved by assertion.

Next: the economic evidence behind several of these verdicts, and the scoreboard.