The most troublesome bits of the United Kingdom are once again showing signs of disuniting. In Scotland, the SNP leader Nicola Sturgeon is demanding a second independence referendum on the grounds that, contrary to the English, the Scots voted to remain in the EU by 62 per cent to 38 per cent. In Northern Ireland, a surge by Sinn Fein to within one seat of the Democratic Unionists after a divisive assembly election has revived the spectre of a united Ireland, now given further rhetorical push by the jubilant nationalists on the grounds that the province also voted to remain.

It is a curiosity that the SNP and Sinn Fein want to leave the UK in order to remain in Europe. In other words, they