Will a hard Brexit spell disaster for London's cosmopolitan art scene?

Art is the definitive globalised marketplace, and London’s dealers are at its centre. Is the UK’s spectacular period of cultural eminence about to collapse?At London’s Frieze art fair last autumn some friends from Vienna and Lahore took me to the Deutsche Bank VIP lounge. There we ate – what else? – micro portions of fish and chips, an ironically British gourmet snack in surroundings that stressed the global nature of the art economy.Now the postmodern canapes are g