The coffee problem
You queue. You pay £4.50. You walk away with a paper cup that is briefly the correct temperature and never has your name spelt correctly.
The cup is cold but you drink it anyway, because £4.20. Your teeth feel like they're wearing yellow tights. You go back tomorrow.
This is the morning ritual of roughly half of London. Compounded over a working year, it costs around a thousand pounds, three hundred paper cups, and a low-grade dental anxiety you can't quite place.