Picture the scene, some time in the 2030s. Three dozen leaders of the European Union’s member states crowd around a gilded desk in some history-laden hall—perhaps in Versailles, Sarajevo or Rome. The Spanish prime minister signs a thick vellum document, before passing the Mont Blanc pen to the German chancellor, then the Ukrainian president. The mood is jovial as, one by one, signatures are affixed on „The Treaty of Accession of the United Kingdom to the European Union (version 2.0)”. As the pen makes its way to the French president, she seems to waver for a second, perhaps recalling past tabloid headlines about bendy bananas and budget rebates. Finally it is the turn of the British prime minister of the day. In one stroke Brexit is reversed; the only member to have left the  EU ’s embrace is now safely back inside.…