Illustration by Daniel Pudles / Ikon Images One consequence of Brexit is that there are no longer British commissioners left in Brussels to press the case for free trade. Germany is fighting other battles. Margrethe Vestager, the formidable Danish competition commissioner, has been the resident free-marketeer in Brussels. But she has lost a brutal power battle, the winner of which is Thierry Breton, the French commissioner for the EU’s internal market. His big trophy last week was to get the European Commission to start a one-year investigation that will surely end with tariffs on Chinese electric cars. The policy is...