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Since the success of this year's election TV debates, it's widely been assumed that they are here to stay in British elections. Indeed I may even have said that myself!

But it won't be quite so simple next time round.

I've already mentioned on this blog the problems that will arise if the next election is on the first Thursday in May 2015, as the coalition partners have pledged, since that will coincide with elections for the Scottish Parliament and Welsh Assembly, scheduled by law for the same day.

The SNP and Plaid Cymru are bound to argue that a three-way debate will be incredibly unfair to them in these devolved elections. And they well may prove successful if they take court action again.

The other big problem arises from the coalition itself. Will a three-way debate with all three leaders getting equal time be appropriate after five years of Lib-Con coalition? In effect you'd have two government leaders - Cameron and Clegg - against one opposition leader (probably called Miliband).

Labour will no doubt argue that's terribly unfair.

But it's hard to think of another format which would work.