Hurrah for David Cameron! He has promised an In-Out referendum on Britain’s membership of the European Union if he wins the next General Election.

Hurrah? Well, no. Not really. For one thing, Cameron has bad form on this. He famously made a “cast-iron” pledge to hold a referendum on the Lisbon Treaty when he was Opposition leader back in 2007. Writing in the Murdoch-owned Sun newspaper, Cameron said:

“The final reason we must have a vote is trust. Gordon Brown talks about “new” politics.  But there’s nothing “new” about breaking your promises to the British public. It’s classic Labour. And it is the cancer that is eating away at trust in politics.  Small wonder that so many people don’t believe a word politicians ever say if they break their promises so casually.  If you really want to signal you’re a break from the past, Prime Minister, do the right thing…