My mum, who lives in England, is coming to visit me in Philadelphia soon and I have given her strict instructions on what to bring from the motherland. Namely, deodorant. You can get a lot of things in the US – it is a land of excess – but the deodorant offerings here stink.

Most American women, you see, tend to use stick deodorants. In the UK, meanwhile, it’s far more normal for women to use a roll-on. Or, at least, its far more normal for shops to stock a wide range of roll-ons. I don’t have some sort of degree in deodorant studies, I........

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