For 10 years I have watched friends of mine make brilliant careers in Europe – but thanks to exactly the kind of red tape we were promised we would be rid of they stay well clear of Britain, says the poet Simon Mundy I t would have been perfectly possible to insulate music, dance, books and the visual arts from the miserable effects of Brexit . After all, it is not necessary to have a political union in order to listen to a concert or see an exhibition. But then the trade negotiators got stuck