Tory party could split if May caves on customs union, Brexiters warn

Brexit-backing Tories have warned the prime minister she risks causing a serious split among Conservatives – and even a permanent breakaway – if she offers any flexibility on a customs union to gain support for her withdrawal deal.Downing Street ruled out customs union membership prior to the start of the cross-party Brexit talks Theresa May promised.The prime minister responded to her historic defeat over the meaningful vote on Tuesday by pledging to speak to “senior parliamen