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And this raises, for people in Britain, a rather more explosive question. It is no longer whether Northern Ireland will leave the EU on the same terms as the rest of the UK. It is whether the rest of the UK will now leave the EU on the same terms as Northern Ireland. Given what seems to have been conceded, there is only one way for Northern Ireland not to have a special status – and that is for all the UK to remain in the customs union.
The hard Brexiters like to see themselves also as hard unionists. But these two positions have just become radically incompatible. There are just two possible outcomes. If Northern Ireland in effect stays in the customs union and Britain leaves, then there will have to be an internal UK customs border, checking goods moving between Northern Ireland and British ports. This undoubtedly weakens the union.
But the only way to avoid this is for the UK as a whole to stay in the customs union – which of course the true believers don’t want either.
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