All logic suggests that the 14-day quarantine for arrivals from abroad really is, as Michael O’Leary of Ryanair put it, ‘a political stunt’. The best explanation is that it was conceived in Downing Street — with minimal consultation, unless someone rang Armando Iannucci, writer of The Thick of It — as a sop to focus-group xenophobia and parental anxiety, as well as a show of grip after the Dominic Cummings debacle.