Pizza reheating and revision

So here I am waiting for the wheelchair-service man to turn up on this lovely sunny day and instructing J on how to reheat a pizza which for some reason has become incredibly complicated - 18 months and you're on your own J so you'd better learn. He's at home on doss about study leave at the moment. He says he's going to do some work later. Please J, just to put my mind at rest, please do some revision.