As I enter Kilburn tube station this morning, I heard my train pulling in, rumbling overhead. I sprinted up the stairs, taking them two at a time, dodging slower people, flying past two little old ladies. "Ooh," said one of them to the other, "I'd love to be able to move like that!"

You have no idea how long I've waited to hear that. Or how long I'll have to wait till I hear it again.