If we are going to have these debates then clear rules are needed: the problem is that the whole thing has sort of followed its nose, as first one party has said "yes", then another, and now not surprisingly others want in on the act.
It needs either to be Lab, Con and LibDem only or else all the national parties with seats in parliament. Or some sort of rule that it's the top four or five or something. Until we get that then this sort of nonsense is going to keep happening.
I don't blame Cameron for hesitating to go on with Farage but not Lucas, say. Why one if not the other? With no rules this is the sort of chaos you get.
I don't agree that Beluga McCaviar, or whoever the latest SNP leader is at the moment, should be on with the others as they are not a national party. Otherwise you need to bring in the DUP, Sinn Fein etc (can you imagine the fuss that would cause)