GETTY Pressure continues to mount on David Cameron to deliver on his promise of a better deal for the UK

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Fifty-three per cent of people quizzed in the ICM survey said they would vote for a UK exit from the EU without a significant shift in power back to Westminster. In contrast, 47 per cent pledged to vote to remain in the EU even without a return of sovereignty from the Brussels bureaucracy.

EPA The poll suggests the Prime Minister will struggle to persuade the electorate to remain in the EU

The poll findings suggest the Prime Minister will struggle to persuade the electorate to vote to remain in the EU unless his current negotiations with European leaders achieves a fundamental change in the country’s relationship with Brussels.

If we vote to leave, the £350million we send to Brussels every week can be spent on priorities like the NHS Kate Hoey, Labour Leave

They also suggested far stronger support for an exit among voters most interested in the referendum campaign. Among that group, 63 per cent pledged to vote to leave the EU while 36 per cent would vote to stay. They poll data was released to mark the launch today of the new cross-party Vote Leave campaign to press for British exit in the forthcoming in-or-out EU referendum. Vote Leave also released a list of more than 20 business leaders committed to supporting the campaign including retail tycoon Lord Kalms, Reebok founder Joe Foster and Patisserie Valerie chairman Luke Johnson.

GETTY German Chancellor Angela Merkel is keen for Britain to stay in the EU

Other prominent backers of Vote Leave included writer and Daily Express columnist Frederick Forsyth, historian Andrew Roberts, economist Roger Bootle and Green Party peer Baroness Jones. Labour MP Kate Hoey, a supporter of the campaign and a co-chair of the Labour Leave group, said: “We must end the supremacy of EU law over UK law. If we vote to leave, then the £350 million we send to Brussels every week can be spent on our priorities like the NHS. I want to see a campaign which brings together those from all parts of the UK who want to take back control of our countries’ laws to the British Parliament.” Leading Labour donor John Mills said: “If we vote to leave the EU we will be able to trade freely with the EU and have friendly cooperation. “The UK will regain legal control of things like trade, tax, economic regulation and energy. We will be able to vote for people who will be able to make our own trade deals and control our own public services. “I would urge everyone to get behind the Vote Leave campaign and make the case for Britain outside the EU.”

GETTY Cameron met with Greek PM Alexis Tsipras earlier this year