Ten years after the referendum, Brexit looks less like a single economic shock and more like a slow squeeze on Britain’s growth model.

The UK did not collapse after leaving the European Union. But it became poorer than it might otherwise have been. Trade became more complicated. Investment weakened. Productivity took a hit. For a country still deeply tied to Europe, the cost of moving further away from its largest market is now harder to ignore.

Britain still sells heavily into the EU and still buys heavily from it. In 2025, the EU accounted for about 41% of UK exports and 50% of imports. That is the central problem. Brexit did not make Britain economically independent from Europe. It made the same relationship more expensive, more bureaucratic and less predictable.

The Office for Budget Responsibility still assumes that Brexit will leave UK productivity around 4% lower in the long run than if the country had stayed in the EU. A 2025 economic study estimated that Brexit had already reduced UK GDP by 6% to 8% by the end of 2025, with investment down by double digits.

This is the real balance sheet of Brexit. Not a dramatic crash, but a steady loss of economic speed.

The promise of “Global Britain” has not replaced the value of frictionless access to Europe. New trade deals have brought limited gains, while exporters, manufacturers and small firms have faced new costs at the border. For many businesses, Brexit did not open the world. It narrowed the nearest and most important market.

The political question is now changing. Britain does not have to reopen the 2016 referendum debate every year. But it does have to decide whether it can afford to keep treating distance from Europe as a strategy.

A full return to the EU may remain politically difficult in the short term. Yet a closer economic model with Europe is becoming more rational. Lower trade barriers, deeper regulatory alignment and a more stable institutional relationship with the single market would reduce pressure on the British economy.

Britain’s historic strength was never built on standing outside Europe completely. It came from shaping the European balance while protecting its own interests. The old imperial reflex no longer fits the economic reality.

For Britain, the way forward is not isolation. It is a new place inside the European economic order, even if that place does not immediately mean full membership.