As Britain formally triggers the doleful negotiations to exclude itself from the mainstream of European politics and economics, Prime Minister Theresa May refuses to use the word “divorce” to describe what is happening. My wife, a retired family lawyer and mediator, thinks May could be correct. After all, the family house we are exiting still contains much of our history and family silver, as well as our future economic interest. In that sense, divorce is scarcely an option. Britain has not been as insular an island as some people take it to be. From our reigning royal family (which is German) to our exports (overwhelmingly to Europe), we have helped to shape and in our turn been shaped by developments …