It was the morning of June 24, 2016, and the United Kingdom woke up to something it had not quite prepared itself for. The Leave campaign had won. Forty-eight percent of the country was shell-shocked. Fifty-two percent was triumphant. And a process that would consume nearly a decade of British political energy had been set irreversibly in motion.
Now, in the autumn of 2026, a full decade since that referendum, Britain finds itself in a peculiar position: no longer consumed by Brexit in the way it once was, but not quite settled into the post-Brexit world either. Trade frictions persist. The NHS staffing crisis has not resolved itself. Scotland continues to eye independence as a route back into the EU. And public polling, which for several years has shown consistent majorities telling surveyors they believe Brexit was a mistake, has begun to generate serious political pressure on a Labour government that came to power in 2024 pledging to “make Brexit work” rather than undo it.
So what would it actually take to reverse course? Not in the abstract, not as a political slogan, but in concrete legal, diplomatic, and economic terms? The answer is considerably more complicated than either committed rejoiners or hardened Brexiteers tend to acknowledge.
A Decade of Economic Reckoning
Before addressing the path back in, it is worth assessing where Britain actually stands after ten years outside the EU’s structures.
The economic consequences of Brexit have been the subject of fierce and ongoing academic debate, but several broad conclusions have solidified. The UK’s trade with the EU fell sharply after the Trade and Cooperation Agreement took effect on January 1, 2021. The Centre for European Reform has published multiple analyses estimating that by the mid-2020s, UK goods trade was roughly 15 percent lower than it would have been had Britain remained in the single market. Services trade, which represents the larger share of the British economy, has faced persistent barriers that the TCA did not adequately address, particularly in financial services and professional qualifications.
The Office for Budget Responsibility, in its assessments from the early 2020s onward, consistently projected that Brexit would reduce long-run UK productivity by around four percent compared to a counterfactual in which the UK remained. That figure has not significantly shifted in subsequent analyses. Four percent may sound modest in a headline but translates to tens of billions of pounds of foregone economic output annually.
There have been compensating factors, and it would be dishonest to ignore them. The UK did secure trade deals that it could not have pursued as an EU member, including agreements with Australia and a deal granting accession to the CPTPP (Comprehensive and Progressive Agreement for Trans-Pacific Partnership) in 2023. Critics note, however, that the combined economic uplift from these agreements has been modest, with government estimates suggesting a long-term GDP boost of under 0.1 percent from the Australia deal alone.
The immigration picture is complicated. EU free movement ended, but net migration to the UK actually rose sharply after Brexit, driven by non-EU arrivals under the new points-based system. This outcome surprised many Leave voters who had been promised control over numbers, not merely over the origin countries involved.
The Legal Architecture of Rejoining
Here is where many public discussions of a potential reversal go wrong. People speak of “rejoining the EU” as though it were a matter of political will followed by a reversal of Article 50. That is not how it works.
Article 50 of the Treaty on European Union provided the mechanism for leaving. There is no mirror-image Article 50 for returning. A country wishing to join the EU must apply under Article 49, the standard accession process. That process was designed for countries like Poland or Romania, states that needed to demonstrate democratic governance, the rule of law, functioning market economies, and the capacity to implement the full body of EU law known as the acquis communautaire. The acquis runs to tens of thousands of pages and covers everything from competition law to agricultural subsidies to food safety standards.
Britain, unlike a new applicant from the Western Balkans, already has deeply compatible legal and institutional systems. That would shorten the process in some respects. But in others, UK accession would be uniquely complicated. The UK spent nearly three years negotiating its departure deal. Reversing that and negotiating re-entry would involve confronting the same structural disagreements about fisheries, Northern Ireland, budget contributions, and governance that made Brexit so contentious in the first place.
Critically, rejoining would almost certainly require adopting the euro. Existing EU members are required to commit to euro adoption upon accession, though the practical timeline for meeting the convergence criteria can be extended. The UK’s opt-out from the euro was a negotiated privilege of its prior membership, not a right that could be claimed again. The prospect of replacing the pound with the euro would be politically incendiary in Britain, cutting across party lines and activating deep currents of national identity that go well beyond economics.
Similarly, the UK’s opt-out from Schengen, the EU’s borderless travel area, was another bespoke arrangement that new members are not guaranteed. Ireland remains outside Schengen, so there is precedent for exceptions, but nothing would be automatic.
Many analysts judge that a realistic accession process would likely take at least five to seven years from formal application, assuming continuous political will on both sides and no serious breakdowns in negotiation. In practice, the process could easily extend to a decade.
The Political Domestic Obstacle Course
Setting aside the EU side of the ledger for a moment, the domestic politics of rejoining are formidable. Britain’s Labour government, led since July 2026 by Prime Minister Andy Burnham after Keir Starmer’s resignation, has so far kept to the carefully bounded position Starmer set out: closer cooperation with the EU through veterinary agreements, reduced trade friction, and improved mobility for young people, but no return to the single market and certainly no referendum on EU membership.
The political logic is understandable. Labour won its 2024 general election majority in large part by assembling a coalition that included voters in seats that voted Leave in 2016. Advocating for full membership would risk fracturing that coalition before it has consolidated. The Conservative Party, reduced to a rump after its 2024 defeat, has largely doubled down on a pro-Brexit identity as one of the few things that differentiates it from Labour. Reform UK, the hard-right party that performed strongly in 2024, treats any rapprochement with Brussels as an existential threat to be mobilised against.
A referendum on rejoining would require extraordinary political courage and a governing majority willing to absorb years of contentious campaigning before a single vote was cast. The 2016 experience left deep scars on Britain’s political class. The country spent three years in near-constitutional crisis, its parliament deadlocked, two prime ministers consumed by the fallout. The appetite for revisiting that process is, to put it gently, limited.
Polling from organisations including YouGov and More in Common has shown consistent majorities saying Brexit was wrong. But there is an important distinction between retrospective regret and active enthusiasm for a new referendum campaign. When voters are asked whether they want a new referendum, the numbers are consistently lower than when they are asked whether Brexit was a mistake. People can believe something was wrong without believing the cure of relitigating it is worth the cost.
What the EU Would Actually Demand
The conversation in Britain about rejoining tends to be conducted as though it were a unilateral British decision. It is not. The EU would have its own requirements, and they would be shaped by years of fractious experience with British membership.
Senior figures in Brussels have been relatively consistent on this point when speaking off the record. They are willing to deepen the relationship with the UK. They value cooperation on defence, intelligence, and the management of shared problems like migration and climate. But the memory of British exceptionalism within EU structures, the constant negotiation of opt-outs, the domestic politics of Euroscepticism bleeding into EU-level dysfunction, is not one that many member state governments are eager to revisit.
France in particular would be a difficult interlocutor. French fishing interests clashed repeatedly with the UK over access to British waters in the years following the TCA. The French political establishment, regardless of which coalition holds power in Paris, has generally preferred a Britain that is a cooperative neighbour rather than an internally conflicted member dragging on EU decision-making.
There is also the question of the EU budget. The UK was a net contributor, paying in more than it received in structural funds and agricultural subsidies. In 2019, the UK’s gross contribution was approximately £14 billion after the rebate. Returning to membership would mean resuming substantial budget contributions at a moment when the EU’s own finances are under strain from defence commitments, green transition spending, and the ongoing costs of supporting Ukraine’s reconstruction.
The Scotland Dimension
Any serious analysis of Brexit reversal must grapple with Scotland. The Scottish National Party’s position since 2016 has been that Brexit, which Scotland voted against by 62 percent, represents a democratic imposition that strengthens the case for independence. An independent Scotland, the SNP argues, could apply for EU membership on its own terms.
The complication is that the route to independence runs through a second referendum that Westminster has refused to sanction under the current devolution settlement. The Supreme Court ruled in 2022 that the Scottish Parliament cannot legislate for an independence referendum without Westminster consent. That constitutional impasse has not resolved itself.
The Scotland question creates an odd dynamic in the rejoining debate. If the UK as a whole were ever to seek re-entry into the EU, it would undercut one of the strongest remaining arguments for Scottish independence. Rejoiners in Scotland face the awkward possibility that their preferred outcome, EU membership, could be achieved in a way that does not deliver independence. SNP strategists have been visibly uncomfortable with this tension.
The Realistic Alternative: A Closer but Bounded Relationship
Given the legal complexity, the domestic political obstacles, and the EU’s own ambivalence, most serious analysts believe the realistic trajectory for UK-EU relations over the next decade is not full membership but rather a progressively closer relationship falling well short of accession.
The model often discussed is something like the relationship Norway or Switzerland has with the EU: deep integration on trade and regulatory standards, participation in some EU programmes, but no formal membership, no vote in EU institutions, and no MEPs. Switzerland’s relationship is governed by a complex web of bilateral agreements, some of which have themselves been contentious and recently renegotiated. Norway is part of the European Economic Area and pays into the EU budget without a seat at the table.
Both the Swiss and Norwegian models have their critics and their defenders. From Britain’s perspective, the central irony is that these arrangements involve accepting large portions of EU regulation while having no say in writing the rules. Critics of Brexit were fond of pointing out that this was “rule-taker” status, precisely the loss of sovereignty that Leave campaigners claimed to be rescuing Britain from.
Labour has been edging toward a closer relationship through incremental steps: a defence and security partnership agreed in May 2025, and ongoing negotiations on a veterinary (SPS) agreement that would ease food and agriculture trade. Each of these steps is presented not as a stepping stone to membership but as a pragmatic improvement to a settled relationship.
Whether that framing is politically sustainable as the economic arguments for closer integration continue to accumulate is one of the central questions of British politics heading into the late 2020s.
The Decade Ahead
Ten years on from the referendum, Britain is neither the liberated, globally confident nation that Leave campaigners promised nor the economic ruin that some Remain campaigners feared. It is something more complicated: a medium-sized European country navigating reduced influence with considerable residual capability, recalibrating relationships that were once taken for granted, and arguing with itself about what it actually wants.
Full EU membership, if it is ever to happen, is almost certainly a project for the 2030s at the earliest, and more plausibly the 2040s, if it happens at all. It would require a referendum, a sustained political consensus that does not currently exist, a multi-year accession negotiation, probable euro adoption, and a willingness in Brussels to welcome back a country whose last stint as a member ended in years of acrimony.
None of that is impossible. History is not a one-way street, and the EU itself has expanded and contracted before, accommodating realities that earlier analysts thought permanent. But the honest answer to the question of what a reversal would require is this: more time, more political will, more institutional goodwill, and more economic pain than Britain has yet experienced or its political class has yet been willing to confront.
The door to Brussels is not locked. But it is considerably heavier than it looks from a distance, and no one on either side has yet decided it is worth the effort of pushing it open.