Weekend opinion polls showed a clear public majority for cutting ties with Brussels as pressure mounted on David Cameron to set out plans for a referendum on the issue.
He faces a tricky summit on Thursday when leaders gather to thrash out the EU's future budget, and he has threatened to veto anything other than a real-terms freeze.
Labour joined forces with Tory rebels to inflict a Commons defeat on the Government by backing a real-terms cut in the 2014-20 package - leading to accusations of opportunism.
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