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Britain would back remaining in the European Union by 53 per cent to 47 per cent if a referendum was held now, according to a major new poll.

Some 45 per cent want a say on the outcome of the Brexit negotiations with 34 per cent opposed, the survey for the People's Vote campaign found.

If talks break down, half of voters said the final decision over whether the UK should leave the bloc or remain in the EU should be taken by the public.

A quarter said Parliament should decide, according to the poll’s results released on Friday.

Opponents of Brexit said the YouGov study of more than 10,000 adults showed public opinion was shifting.

Peter Kellner, a leading pollster and former president of YouGov, said the findings were "politically significant".

He said: "Across the spectrum, the message from voters in this survey is clear: if the Government and Parliament can't sort out Brexit, the people should."

Labour voters overwhelmingly said they would back remaining in the EU, some 77 per cent to 23 per cent for Leave.

Most back a referendum on the exit deal, 63 per cent compared to 18 per cent.

Mr Kellner said the polling showed the chasm between Labour members and the leadership over its approach to Brexit.

Brexit: Article 50 Triggered - In pictures 20 show all Brexit: Article 50 Triggered - In pictures 1/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 2/20 Prime Minister Theresa May speaks during Prime Minister's Questions in the House of Common PA 3/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 4/20 5/20 6/20 7/20 European Council President Donald Tusk holds a news conference after receiving British Prime Minister Theresa May's Brexit letter in notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 8/20 Prime Minister Theresa May takes her seat after announcing in the House of Commons PA 9/20 The time 12:20pm shows on Big Ben on March 29, 2017 in London, England. The British Prime Minister Theresa May addresses the Houses of Parliament as Article 50 is triggered and the process that will take the United Kingdom out of the European Union begins Carl Court/Getty Images 10/20 D-day: pro-EU protesters outside of the Houses of Parliament today as Theresa May prepares to trigger Article 50 AFP/Getty Images 11/20 EU Council President Donald Tusk holds British Prime Minister Theresa May's Brexit letter which was delivered by Britain's permanent representative to the European Union Tim Barrow (not pictured) that gives notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty in Brussels, Belgium Yves Herman/Reuters 12/20 PMQ's in The House of Commons PA 13/20 Jeremy Corbyn speaking at PMQ's in The House of Commons Sky News 14/20 Theresa May leaving for the House of Commons Jeremy Selwyn 15/20 Mayor of London Sadiq Khan at the headquarters of Vivendi in Paris where he took part in TV interviews to discuss the imminent triggering of Article 50 by the UK to leave the EU Stefan Rousseau/PA 16/20 Britain's permanent representative to the European Union Tim Barrow arrives at the EU Council headquarters for as meeting before hand delivering British Prime Minister Theresa May's notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 17/20 Britain's ambassador to the EU Tim Barrow arrives at the British representation of the European Union in Brussels Aurore Belot/AFP/Getty Images 18/20 A giant headed Theresa May in Parliament Square, London during a protest by Avaaz after PM signed a letter to trigger Article 50 that starts the formal exit process by the UK from the European Union David Mirzoeff/PA 19/20 British Foreign Secretary Boris Johnson walks down Whitehall Jack Taylor/Getty Images 20/20 Britain's PM Theresa May signs the official letter to European Council President Donald Tusk, invoking Article 50. AFP/Getty Images 1/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 2/20 Prime Minister Theresa May speaks during Prime Minister's Questions in the House of Common PA 3/20 Britain's ambassador to the EU Tim Barrow delivers British Prime Minister Theresa May's formal notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to European Council President Donald Tusk in Brussels AFP/Getty Images 4/20 5/20 6/20 7/20 European Council President Donald Tusk holds a news conference after receiving British Prime Minister Theresa May's Brexit letter in notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 8/20 Prime Minister Theresa May takes her seat after announcing in the House of Commons PA 9/20 The time 12:20pm shows on Big Ben on March 29, 2017 in London, England. The British Prime Minister Theresa May addresses the Houses of Parliament as Article 50 is triggered and the process that will take the United Kingdom out of the European Union begins Carl Court/Getty Images 10/20 D-day: pro-EU protesters outside of the Houses of Parliament today as Theresa May prepares to trigger Article 50 AFP/Getty Images 11/20 EU Council President Donald Tusk holds British Prime Minister Theresa May's Brexit letter which was delivered by Britain's permanent representative to the European Union Tim Barrow (not pictured) that gives notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty in Brussels, Belgium Yves Herman/Reuters 12/20 PMQ's in The House of Commons PA 13/20 Jeremy Corbyn speaking at PMQ's in The House of Commons Sky News 14/20 Theresa May leaving for the House of Commons Jeremy Selwyn 15/20 Mayor of London Sadiq Khan at the headquarters of Vivendi in Paris where he took part in TV interviews to discuss the imminent triggering of Article 50 by the UK to leave the EU Stefan Rousseau/PA 16/20 Britain's permanent representative to the European Union Tim Barrow arrives at the EU Council headquarters for as meeting before hand delivering British Prime Minister Theresa May's notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty to EU Council President Donald Tusk in Brussels, Belgium Yves Herman/Reuters 17/20 Britain's ambassador to the EU Tim Barrow arrives at the British representation of the European Union in Brussels Aurore Belot/AFP/Getty Images 18/20 A giant headed Theresa May in Parliament Square, London during a protest by Avaaz after PM signed a letter to trigger Article 50 that starts the formal exit process by the UK from the European Union David Mirzoeff/PA 19/20 British Foreign Secretary Boris Johnson walks down Whitehall Jack Taylor/Getty Images 20/20 Britain's PM Theresa May signs the official letter to European Council President Donald Tusk, invoking Article 50. AFP/Getty Images

"Labour supporters overwhelmingly back a new public vote and, in resisting this, the party's leadership is increasingly out of touch with its own voters," he said.

"If these findings emerged from a conventional poll of 1,000-2,000 respondents, findings relating to sub-samples should be regarded with caution.

"But this exceptionally large 10,000 sample survey contains more than 2,700 current Labour supporters, leaving no room for doubt about the size of the majority among them for a new public vote.

The 53 per cent to 47 per cent result in favour of remaining in the EU excludes those who do not know how they would vote or would not bother.

A no deal scenario pushes the six-point margin to 12 per cent, 56 per cent Remain to 44 per cent Leave, the study found.

Nearly three quarters, 73 per cent, believe many of the promises made by the Leave campaign will be broken and 68 per cent fear the UK will end up with a bad deal, with 64 per cent ready to lay the blame on the Government.

Labour's Chuka Umunna, who backs the People's Vote campaign, said: "Politicians of all sides are increasingly trapped inside red lines of their own making, but the momentum this summer is with the campaign for a people's vote as more and more people realise it's the only way to take back control of the process.

"It is clear from YouGov's findings that public opinion is moving behind a people's vote across the political spectrum.

"This poll shows that Labour voters overwhelmingly support a people's vote, putting them at odds with the party's official pro-Brexit position.

"The Labour Party must now do what its members and supporters and voters are crying out for: put clear red water between the Opposition and the Government, and provide leadership to the country by backing the People's Vote campaign."