There are three things you can usually guarantee from Cameron at PMQs, when they have them (Just about to have their third holiday in less than 3 months). He will blame it on the last government (He'd blame it on Atlee if he could get away with it), he'll insult somebody, and he'll lose his temper. And when he is losing the argument badly, he'll bring in the democratically elected worker representatives although he'll use the term Trade Unions as if it's a bad thing.