The prime minister also admitted that he's scared of rats – but can deal with spiders.

"I'm not very keen on rats, we had one in our kitchen once, it came in through the cat flap," he said. "It was horrible, and I kind of found it in the middle of the night. I'd like to say I stripped down to the waist and wrestled it and threw it out, but I didn't.

"It had found a hole in the skirting board and it was disappearing through that. So, not nice! But if there's a spider in the bath send for me! Samantha's not good on spiders, but I can do creepy crawlies."

Oh, and he had to hold a baby crocodile recently, which he didn't particularly enjoy.