Really? I doubt it.
Cameron, as far as I can see, is no EU sell-out. Obviously when and if he gains power, it'll be something to watch, but I don't think the party will let him - it's generally too Eurosceptic.
"Hand the decision to the BBC"? Sounds far too conspiracy theory-type for me. British people are generally fiercely independent, we know about BBC bias.
And it is a necessary referendum, as I explained in my last post - it involves transfer of political power. Not only that, but 70% of the population want it. As well as this, the general call for a referendum was because that was what the three main parties promised (and only one kept to) - there was no "wrecking amendment" in the manifesto.
I think the important thing will be to withdraw ratification, then hold the referendum, then re-ratify or withdraw altogether depending on the vote. Otherwise some funny things could be done in other countries to make the referendum practically invalid.