In the game of ‘U’ and ‘Non-U’, begun by Alan S.C. Ross (1907-80) and popularised in Nancy Mitford’s volume Noblesse Oblige, some words embody upper-class usage (U), and some definitely do not. To the Non-U toilet and serviette might be added floorin the sense of the ground outdoors.

Did Boris Johnson succumb to Non-U usage in remarks about coronavirus? ‘If this virus were a physical assailant, an unexpected and invisible mugger,’ he said, ‘then this is the moment when we have begun together to wrestle it to the floor.’