Cameron is a wuss. He should order a referendum just to spit the Germans.
needing a vote and voice in a organisation just to say no to most things while threatening to leave while not really wanting to leave because of the negative economic effects has always been a difficult position for the prime minister but now it is a mess.
The situation has changed and now Cameron may find himself in a situation where Merkel might say then leave and good luck at all i have real problems to solve.
The last thing a brisith PM needs is a honest debate about that where reality faces emotions economic leaders the average people and a conservative PM who would need to declare himself.