We are all drama queens, really, we political hacks; and so we were all thoroughly delighted by Theresa May’s Tuesday coup. I have long been arguing that we would have an election this year, and I had been beginning to feel lonely. But one big thing I got wrong: it had seemed to me in January that a Brexit election would shatter much party discipline, since the voters would be principally interested in where candidates stood on the Great Issue and both Tories and Labour were deeply divided about it.