British politics is still polarised around Brexit, although 10 years on from the referendum, the terms of debate are very different. Or they should be. Russia’s invasion of Ukraine in 2022 has moved discussions of European solidarity from the realm of abstraction to a matter of urgent defence partnership. Donald Trump’s presidency in the US, marked by scorn for European democracies and indulgence of Vladimir Putin, has undermined confidence that Britain can rely on any “special relationship” with Washington.

Under these circumstances, it would be absurd to deny that a reappraisal of Brexit is in order. The prime minister acknowledged this in his speech at the Labour party conference last month, calling for a national conversation about the future relationship with every option, including rejoining, on the table. The Eurosceptic opposition are having none of........

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