This week Michel Barnier, the European Union’s chief negotiator in the Brexit negotations laid out what Britain could expect in the coming talks over the terms of its departure from the E.U. — a strict timetable, key negotiating principles, and strong demands. Anyone seeking a reciprocal list from London, however, had to make do with this: “What we should be looking for is a red, white and blue Brexit,” Prime Minister Theresa May said, citing the colors of the British flag.