The Independent on Sunday records a senior Tory MP saying yesterday that Mr Cameron would have to move quickly in the first year and a half of his premiership and had to show "real progress" on his promises.
The MP said: "I don't think a promise of a referendum on Britain's relationship with the EU in more than five years will sit very well. He [Cameron] needs to make progress, within the first 18 months of his premiership. If he does, it will be his crowning glory, but if he doesn't, it will be a thorn in his side."
Another Eurosceptic backbencher said: "We have agreed to keep quiet on this before the election, but if things do not start happening in the first year or so, there will be all-out war for a referendum."
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