There is a theory which states the primary reason for Boris Johnson’s political longevity is that there are simply so many scandals that the latest infidelity drives the last one from public consciousness before it really has time to sink in.

‘Who paid for his wallpaper? Meal delivery? He had a party while forcing the country into social isolation and atomisation? How many parties— what do you mean the police are investigating him?’

At this point, it seems like the revelation most likely to do him in will be the discovery that, at some point in the last two years, Boris Johnson...