http://www.bbc.co.uk/news/uk-politics-31771198
I will straight off that I don't think these TV Debates are a very useful idea at all.
If 7 Parties, and maybe 8, are going to appear together on the same platform, its going to look like Celebrity Squares with Suits. It will descend into a horizontal Tower of Babel.
Having said that, if these three debates ARE going to go ahead, I quite simply can't understand why Cameron won't take part. If all the other Parties are going to be there, and the Tories aren't, what kind of signal is that going to present to the Electorate ?
Personally I think dave has shot himself in the foot here, especially as he was so keen for these debates to take place only a very few years ago. If every other Party Leader is keen and willing to take part and he isn't, then people will make their own conclusions.