The Producers review - daring delight is the sparkling standout of London's festive theatre / 'It's licensed touting, essentially': has sky high ticket pricing turned London theatre into the wild West End? / British theatres bring array of new shows, but are 'in a precarious position' / 'A national emergency': UK theatres fear closure after more local funding cuts / A Year After Their Funding Was Cancelled, Here’s What UK Theatres Have Done