The United Kingdom faces a dual crisis in mid-2026: a decade after the Brexit referendum, economic analysis confirms what most economists predicted — the decision to leave the European Union has left the British economy an estimated 6% to 8% smaller than it would have been — while Sir Keir Starmer's resignation as Prime Minister has plunged the country into fresh political uncertainty just as it grapples with the long-term consequences of that 2016 vote. (In the UK parliamentary system, the Prime Minister is typically the leader of the party with the most seats in Parliament, not directly elected.)
Why This Matters for Portugal:
• Trade partners: The UK represents a significant export market for Portugal, particularly in tourism and goods sectors; a smaller and weaker British economy means reduced demand for Portuguese exports.
• Expat considerations: Roughly 40,000 Portuguese citizens live in the UK, facing employment and wage pressures as the British economy underperforms. Portuguese citizens who secured settled status under the EU Settlement Scheme maintain residence and work rights, though economic pressures affect job security regardless of immigration status.
• Investment climate: British firms relocating operations to the EU have shown preference for Central European manufacturing hubs, with limited relocation to Portugal.
• Currency impact: The pound sterling has declined approximately 10% against the euro since the 2016 referendum and has not recovered, making Portugal more expensive for British tourists and property buyers.
The Economic Verdict: A Decade of Gradual Decline
Ten years after British voters chose to leave the European Union, the Office for Budget Responsibility and independent economists have converged on a sobering conclusion: Brexit has delivered neither the economic renaissance promised by Leave campaigners nor the immediate collapse predicted by some Remain supporters. Instead, the UK economy has experienced what analysts describe as a "gradual and cumulative drag" on trade, investment, and productivity.
The numbers tell a stark story. The UK's Gross Domestic Product is estimated to be 4% to 8% smaller than it would have been had the country remained in the EU. Business investment has fallen 12% to 18% below projected levels, hampered by prolonged regulatory uncertainty and the loss of automatic market access to the continent. Long-term productivity is roughly 4% lower, primarily because reduced trade intensity has made the British economy less open and less efficient.
Trade with the European Union — still Britain's largest commercial partner — has contracted significantly. Exports of goods are 10% to 15% below what they would have been, with similar effects on imports. Between 16,000 and 20,000 small UK businesses have stopped exporting to the EU altogether, unable to absorb the additional bureaucracy and customs costs imposed by the new border regime.
What This Means for Portuguese Stakeholders
For Portugal's perspective, the UK's economic underperformance has tangible consequences. British tourists, who traditionally represent one of Portugal's top visitor markets, now find their purchasing power diminished by a pound that has not recovered its pre-2016 levels. The currency depreciated roughly 10% against both the dollar and the euro since the 2016 referendum and has remained structurally weaker, making holidays in the Algarve, property investments in Lisbon, and Portuguese wine imports more expensive for British consumers.
Portuguese exporters face a dual challenge: not only is the UK market smaller and less prosperous than it would have been, but non-tariff barriers — customs checks, rules-of-origin requirements, regulatory paperwork — have made doing business across the Channel more costly. While the Trade and Cooperation Agreement negotiated in late 2020 avoided tariffs on most goods, it did nothing to eliminate these administrative frictions.
The roughly 40,000 Portuguese citizens living in the UK have witnessed a reconfigured labor market. Employment levels are estimated to be 3% to 4% lower than they would have been without Brexit. While nominal wages in some sectors have increased by an average of 3.5% compared to pre-Brexit levels, real wage growth in 2026 is projected at just 1.1% — one of the lowest rates among major European economies. By comparison, the EU as a whole registered wage growth of 3.7% year-on-year in March 2026, with Germany and France projecting real increases of 1.7%.
The Political Earthquake: Starmer's Abrupt Exit
On June 22, Sir Keir Starmer resigned as Prime Minister and leader of the Labour Party, triggering a leadership contest that will determine the UK's next head of government. His departure came just days after Andy Burnham, the former Greater Manchester Mayor, won a parliamentary by-election in Makerfield with the explicit goal of challenging Starmer's leadership — a move that crystallized months of mounting internal party dissatisfaction.
Starmer's downfall was driven by multiple converging pressures. The Labour Party suffered catastrophic losses in the May 2026 local elections, surrendering control of 35 councils and losing approximately 1,500 councillors. The national vote share projection placed Labour at a dismal 17%, in third place behind the Conservatives — a stunning reversal for a party that had won a general election less than two years earlier.
Public opinion had soured dramatically. By January 2026, 75% of respondents held an unfavorable view of Starmer, according to YouGov polling, with a net favorability rating of -57. By June, just before his resignation, that figure had marginally improved to -45, but the damage was irreversible. Internal party rebellion intensified when key ministers — including Wes Streeting (Health Secretary) and John Healey (Defence Secretary) — resigned in protest over policy decisions and personnel appointments.
The Leadership Race and What Comes Next
The process to select Labour's new leader — and therefore the UK's next Prime Minister — began formally on July 9, with nominations closing on July 16. Candidates must secure endorsements from 20% of Labour MPs (81 members) plus either 5% of local constituency parties or at least three affiliated organizations, including two trade unions representing a minimum of 5% of affiliated membership.
If only one candidate meets the threshold, they could be sworn in as Prime Minister as early as July 17. If a contest emerges, the new leader will be chosen by September 1, when Parliament returns from summer recess. Voting uses a preferential system, requiring the winner to capture more than 50% of votes from party members and affiliated supporters.
Andy Burnham has emerged as the clear frontrunner, capitalizing on his dramatic by-election victory and his reputation as a pragmatic centrist capable of reconnecting Labour with voters outside London. Other names circulating include Angela Rayner, the former Deputy Prime Minister popular with the party's soft-left faction; Ed Miliband, the former party leader now serving as Energy Secretary; and Shabana Mahmood, who has secured backing from influential Labour figures. Wes Streeting, initially considered a strong contender due to his communication skills, has thrown his support behind Burnham.
The Brexit Factor in Britain's Leadership Crisis
While Starmer's resignation stems primarily from domestic political failures, the economic legacy of Brexit looms as context. The persistent underperformance of the British economy — stagnant productivity, reduced investment, weakened currency — has constrained the government's fiscal space, limiting its ability to fund public services and deliver tangible improvements in living standards.
Two-thirds of British voters now believe Brexit has increased their cost of living and harmed the economy, according to recent polling. A significant portion of the electorate supports restoring closer economic ties with the EU, and many would accept the return of free movement in exchange for improved trade relations. Yet neither major political party has openly advocated rejoining the single market or customs union, mindful of the political sensitivities around reopening the Brexit debate.
The new Prime Minister will inherit an economy that, by 2026, is broadly understood to be smaller, less productive, and less attractive to investors than it would have been had Britain voted differently in 2016. Whether Burnham or another candidate takes the helm, reversing or mitigating Brexit's economic effects will require navigating political minefields that ended Starmer's brief tenure at Number 10.
The Path Forward: Limited Options, Structural Damage
For Portugal and other EU member states, the UK's ongoing struggles serve as a cautionary tale about the costs of disengagement from integrated European markets. While Britain has secured independent trade agreements with markets in the Asia-Pacific and elsewhere, these deals are projected to have negligible material impact on GDP, failing to compensate for lost EU trade.
Service exports — a traditional British strength — have performed better than expected in some areas, including trade with Spain. Yet regulated service sectors have lost critical access rights to EU markets, particularly in financial services, where some firms have relocated operations to Frankfurt, Paris, and Dublin.
The pound's structural weakness continues to favor British exports on price but also reflects deeper concerns about the UK's economic trajectory. For Portuguese investors considering British assets or markets, the currency discount comes with heightened political risk, as the UK government has experienced significant leadership changes reflecting ongoing political instability.
As the leadership contest unfolds over the next six weeks, the fundamental economic reality remains unchanged: a decade after the Brexit referendum, the United Kingdom is measurably poorer, less integrated, and less stable than it was when voters went to the polls in June 2016. The new Prime Minister, whoever emerges, will face the unenviable task of managing that legacy while attempting to restore public confidence in both the economy and the political system itself.
