Sorry, I can’t come up with a more professional headline, but I am flailing with utter joy, here.

This…. later this evening, Dan is going to be on The Graham Norton Show, on BBC1.

And he will perform his party piece.

I can sing this, too… I was totally brought up on it… and it’s big with maths undergraduates… and it’s now under the ‘read more’ to save our columns …