The problem for Mr Cameron is that he leads a eurosceptic party in a coalition government which has chosen to freeze the issue

What is the reason for David Cameron's decision to float the possibility of a British referendum on Europe once more? Is it because Britain faces an existential or constitutional turning point in its membership of the European Union right here, right now, which cannot be resolved by any other means, and on which the government has a clear position? That, after all, has long been the basis on which the use of a referendum has been put forward by those who advocate them. But the case for that kind of claim, not easy at the best of times, is at this time utterly premature.

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