EU Membership

The Prime Minister has otlined his plan for dealing with the problem of EU membership. Simple put it is to renegotiate the terms of the UK's membership and then to give the people an opportunity to vote in an 'in/out' referendum.
However it takes two to negotiate and I simply ask: What if the unelected EU leadership refuses to take part? What leverage does the Prime Minister have unless he threatens to withdraw the UK's millions? Quite frankly, I see Mr. Cameron's posturing as just that. He, I suggest, is a committed europhile, procrastinating in the hope that the problem goes away. Messrs Portillo, Lawson and Gove already realise this and others will surely follow.