There were a few more surprising titbits in James Corden's interview with David Cameron, where the Prime Minister insisted he wasn't bothered if Boris Johnson was after his job.
"I want him to get back in Parliament. I think he's great," the PM said.
"It's a bit like football - if you have got a great striker you want him on the pitch.
"It's up to him. He can complete as Mayor, or he can stay on as Mayor and come back to the House. I want him on the team."
But the PM also revealed his own footballing faux-pas, and whether he gave Michael Gove the "hairdryer treatment" a la Sir Alex Ferguson, after the Education Secretary's apparently wine-fuelled rant that Johnson has "no gravitas" and Theresa May has "no friends", with only George Osborne fit to be the next leader.
Here's what we learnt:Suggest a correction