Hetherington, the Lady Gaga shocker of his age, was arrested for breaching the peace but his curious hat caught on and by the 1830s even the King could be seen sporting one. The walls of Lock & Co are adorned with artefacts from a time when top hats were common on the streets and in the stock exchange. The head shapes of Evelyn Waugh, Lord Lucan and Lawrence Olivier are framed on one side of the shop but my eye is drawn to a particularly potato-like set of measurements – Charlie Chaplin’s.