“While people are cramming into cinemas, museums and concert halls, the vast majority of theatres remain obstinately shut. It’s mad. It’s anomalous. Now, at last, something is being done about it. Nicholas Hytner, the director of the National Theatre, who has already revolutionised seat prices with his £10 Travelex-sponsored ticket scheme, is now working hard on his next big idea: to phase in Sunday opening.”