But both leaders will have to remember that if they behave in the debates as they do in PMQs it would be a disaster for them. The aggressive, shouty nature of PMQs would not translate well to the debates.
One thing to watch today is what Nick Clegg does. He’s racheting up the rhetoric again, repeating his claim that the other two parties are corrupt. It’ll be interesting if he takes the opportunity of PMQs, where he has tried to lump the two main parties together as part of the problem for the past few weeks, to launch a heated denunciation of the whole system.