History, we’re told, is written by the victors. But nowadays, it seems it’s museum curators who really have the final word. Across the UK, our much-loved national institutions have been led astray by a minority of campaigners, with no regard for the wishes of the public at large. It has become almost impossible to visit a museum in Britain today without coming across a sign or installation condemning several centuries of scholarship in favour of an activist’s manifesto.