When British politicians speak about Brexit and its penalties, they have an inclination to undertake rictus grins and guarantee us that, by some miracle as but unexplained, all the things goes to be OK. The Labour chief Keir Starmer, who just a few years in the past was a passionate advocate of a second referendum on our exit from the EU, now has a five-point plan to “make Brexit work”. In the meantime, because the Tory management contest grinds on, each the candidates are at pains to assert that life exterior the EU goes…