Still making headlines, it seems, is one of the more trivial scandals to have dogged the Labour government in its first 100 days in office: to wit, the police protection given to the pop singer Taylor Swift. File firmly under circuses, you might think, rather than bread.

For those who need catching up, the American pop star was given a VVIP police escort around London during the UK leg of her Eras tour – a swishy blue-light motorcade of the sort usually reserved for members of the royal family and foreign heads of state, and the reassuring knowledge that should some...