The mystery of London’s pyramid hat man

Here’s a riddle for you:

Q. What do you call a man with a metal pyramid on his head?
A. Dominic, apparently.

That answer probably isn’t the clever pun you were expecting. But it is the truth. Now you’re wondering which man is wearing a pyramid on his head. Let me show you. It’s this man:

Pyramid Hat Man wearing his hat

I spotted him yesterday in the Leicester Square Pret A Manger, sketching in a notebook.

And how do I know he’s called Dominic? I’ll get to that…