Have hat manners evaporated entirely, just at the moment when men’s hats have become fashionable again (trilbies and pork-pie hats in addition to the common baseball cap)? A generation or two without hats have left men with no idea how to use them, no idea even that there should be rules.

I often see tourists walk into my local church in central London quite unaware that they are wearing a baseball cap and that it should be taken off. Perhaps they might be more aware that they should have one on if they wandered into a synagogue. Even less familiar is