Covid marshals have invaded theatreland. Arriving for a weekday matinee at the Bridge, I was greeted by stewards holding up illuminated boards. ‘PLEASE WEAR A FACE COVERING.’ Inside, the seating had been rearranged into clumps of twos and threes with the odd single perch sticking out like a toadstool. Nicholas Hytner offered us a pair of the best-loved scripts by his favourite living playwright, Alan Bennett.