Let us suppose that along the coast of Normandy up to one million non-EU migrants are waiting to be packed like sardines in small unseaworthy vessels and to cross the English Channel.

Let us suppose that first the Royal Navy, then the navies of a dozen other EU countries, start to search for all such vessels in the Channel right up to the French coast, out into the North Sea and the Atlantic even, and then ferry all the passengers on board to Dover, Folkestone, Hastings, Eastbourne and Brighton in a surreal modern-day never-ending version of the Dunkirk evacuation of 1940....