Brexit supporters are overeducated toffs who dream of ruling the waves and biffing Johnny Foreigner. Or they are racist proles too dim to see through the lies of the Brexit campaign. Either way, they have one thing in common — they are all, every one of them, as thick as the slowest-witted plant in your garden.

That link between low IQ and a Brexit vote is now an entrenched ideology among many, if not most, remainers. You hear it at dinner parties, you see it on television, you read it in frothing newspaper columns and you can detect it in the fear of professional or private exposure among many “leave” voters.

But, from today, Brexiteers can come out of the closet and hold their heads