Business
UK Economy Nearly 10% Weaker Than Peers After Years of Brexit-Linked Drag, New Analysis Finds
A decade after the Brexit referendum, the UK economy has significantly diverged from its pre-2016 path, with a new report showing that prolonged uncertainty and reduced business investment have left the country substantially weaker than comparable advanced nations.
The analysis, published by the Decision Maker Panel at King’s College London, estimates that by early 2025 the UK economy was about 8% smaller than it would have been had it remained in the EU, based on national macroeconomic data. Firm-level data suggests a slightly smaller but still substantial gap of around 6%.
Researchers say the drag did not come from a single shock but from years of hesitation across the business landscape. Political turbulence, shifting trade rules and repeated negotiations led companies to freeze or delay investment, hiring and expansion. Instead of concentrating on new products or growth strategies, managers redirected time and resources toward contingency planning and adjusting to evolving regulations.
“Investment is estimated to have been 12% to 18% lower, employment 3% to 4% lower, and productivity also 3% to 4% lower than it would have been if the UK had not voted to leave the EU,” the report states.
The effects have varied across sectors. Companies most deeply tied into European supply chains — many of them high-productivity exporters — absorbed the hardest impact. Researchers describe the Brexit shift as a rare example of a “reverse trade reform,” noting that barriers were raised rather than dismantled.
While trade volumes did not collapse immediately after the referendum, the study highlights that this was partly because existing EU rules remained in place for several years. The major break came when the Trade and Cooperation Agreement took effect, marking a clear divergence in the UK’s trading conditions.
As the 2010s gave way to the post-Brexit era, the UK’s economic position slipped against other advanced economies. The report estimates that UK GDP per capita has grown between 6% and 10% less than similar countries, placing the country around the 10th percentile among its international peers.
Researchers also concluded that many early forecasts, although directionally correct, underestimated how persistent uncertainty would be. What policymakers initially viewed as a temporary period of adjustment has become an extended structural shift affecting investment behaviour, productivity performance and confidence.
The findings outline a picture of a country reshaped not by a single political decision but by years of diverted business energy and weakened competitiveness. Almost ten years after the referendum, the report argues, the economic effects continue to ripple through the UK, with little indication that the long-term drag has yet begun to ease.
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