Nick Clegg and David Cameron

2.43pm: Q: Does Cameron regret saying his favourite joke was "Nick Clegg"?

Clegg appears not to have heard this before. He says, "I'm off ... "

Cameron jokes: "Come back." There is much laughter from the press. He says he is prepared to eat humble pie and swallow some of his words. He cannot think of a better diet to give Britain good government.