Labour will fall behind the Liberal Democrats if Jeremy Corbyn helps Theresa May secure a Brexit deal, according to the latest YouGov poll.

The new survey shows Labour would slump to third place, on 22 per cent behind the Liberal Democrats on 26 per cent, should the party support the Conservatives in pushing a deal through parliament.

The poll, commissioned by the People’s Vote campaign, suggests millions of young people could desert the party over the issue. Labour’s support among 18 to 29-year-olds would be halved from 60 per cent to just 33 per cent if the party backs a compromise deal to leave the EU.

Those who voted for Mr Corbyn’s party at last year’s general election and also voted Remain in 2016 said they are more likely to switch to the Lib Dems (49 per cent) than vote Labour (41 per cent) at the next election.

The survey suggests there is little downside to Labour backing a second referendum. Among Labour supporters another vote is massively popular, with 77 per cent in favour and just 23 per cent against.

The YouGov poll also shows growing support for Britain remaining in the EU more generally.

When asked to choose between staying in the EU and Ms May’s Brexit deal, Remain enjoys an 18-point lead: 59 to 41 per cent. Counting only those who say they are certain to vote, Remain currently leads by 63 to 37 per cent.

The biggest single reason why Remain has moved into a clear lead is that few Leave voters now think Brexit will make the economy better.

Final Say petition delivered to Downing Street Show all 30 1 /30 Final Say petition delivered to Downing Street Final Say petition delivered to Downing Street Today the Independent's Final Say campaign and People's Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa May's Brexit deal The Independent/Lucy Young Final Say petition delivered to Downing Street L to R: Christian Broughton, Editor, The Independent, Justine Greening, Conservative MP for Putney, Labour MP for Streatham Chuka Umunna, Lara Anne Spirit from People's Vote, Caroline Lucas, Green Party MP for Brighton Pavilion, Holly Baxter, Co-Editor Independent Voices and Christina Koci-Edwards from People's Vote hand in a petition to Downing Street The Independent/Lucy Young Final Say petition delivered to Downing Street Front row L to R: Christina Koci-Edwards from People's Vote, Caroline Lucas, Green Party MP for Brighton Pavilion, Labour MP for Streatham Chuka Umunna, Christian Broughton, Editor, The Independent, Vince Cable Lib Dem MP for Twickenham, Lara Anne Spirit from People's Vote and Justine Greening, Conservative MP for Putney The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street The Independent's editor Christian Broughton delivered over one million Final Say signatures and People's Vote spokesman Chuka Umunna MP delivered 300,000 signatures to Downing Street on Monday December 3 at midday The Independent/Lucy Young Final Say petition delivered to Downing Street A supporter of the second referendum helps Vince Cable Lib Dem MP for Twickenham out of the rain during a protest The Independent/Lucy Young Final Say petition delivered to Downing Street L to R: Caroline Lucas, Green Party MP for Brighton Pavilion, Labour MP for Streatham Chuka Umunna and Justine Greening, Conservative MP for Putney hand in petitions to Downing Street. Today the IndependentÕs Final Say campaign and PeopleÕs Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa MayÕs Brexit deal. The IndependentÕs editor Christian Broughton delivered over one million Final Say signatures and PeopleÕs Vote spokesman Chuka Umunna MP delivered 300,000 PeopleÕs Vote signatures to Downing Street on Monday December 3 at midday. © Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street L to R: Labour MP for Streatham Chuka Umunna, Lara Anne Spirit from People's Vote, Christian Broughton, Editor, The Independent, Caroline Lucas, Green Party MP for Brighton Pavilion, Justine Greening, Conservative MP for Putney and Christina Koci-Edwards from People's Vote on their way to hand in a petition to Downing Street The Independent/Lucy Young Final Say petition delivered to Downing Street Christian Broughton, Editor, The Independent, Justine Greening, Conservative MP for Putney and Labour MP for Streatham Chuka Umunna hand in the petition to Downing Street The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street L to R: Christina Koci-Edwards from PeopleÕs Vote, Labour MP for Streatham Chuka Umunna ,Christian Broughton, Editor, The Independent, Justine Greening, Conservative MP for Putney, Caroline Lucas, Green Party MP for Brighton Pavilion, Holly Baxter, Co-Editor Independent Voices and Lara Anne Spirit from PeopleÕs Vote. Today the IndependentÕs Final Say campaign and PeopleÕs Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa MayÕs Brexit deal. The IndependentÕs editor Christian Broughton delivered over one million Final Say signatures and PeopleÕs Vote spokesman Chuka Umunna MP delivered 300,000 PeopleÕs Vote signatures to Downing Street on Monday December 3 at midday. © Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Front row L to R: Christina Koci-Edwards from PeopleÕs Vote, Caroline Lucas, Green Party MP for Brighton Pavilion, Labour MP for Streatham Chuka Umunna, Christian Broughton, Editor, The Independent. Lara Anne Spirit from PeopleÕs Vote, , J and on their way to hand in a petition to Downing Street. Today the IndependentÕs Final Say campaign and PeopleÕs Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa MayÕs Brexit deal. The IndependentÕs editor Christian Broughton delivered over one million Final Say signatures and PeopleÕs Vote spokesman Chuka Umunna MP delivered 300,000 PeopleÕs Vote signatures to Downing Street on Monday December 3 at midday. © Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Caroline Lucas, Green Party MP for Brighton Pavilion, Labour MP for Streatham Chuka Umunna and Justine Greening, Conservative MP for Putney hand in petitions to Downing Street The Independent/Lucy Young Final Say petition delivered to Downing Street Front row L to R: Christina Koci-Edwards from PeopleÕs Vote, Caroline Lucas, Green Party MP for Brighton Pavilion, Labour MP for Streatham Chuka Umunna, Christian Broughton, Editor, The Independent, Vince Cable Lib Dem MP for Twickenham, Lara Anne Spirit from PeopleÕs Vote and Justine Greening, Conservative MP for Putney. Lara Anne Spirit from PeopleÕs Vote, , J and on their way to hand in a petition to Downing Street. Today the IndependentÕs Final Say campaign and PeopleÕs Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa MayÕs Brexit deal. The IndependentÕs editor Christian Broughton delivered over one million Final Say signatures and PeopleÕs Vote spokesman Chuka Umunna MP delivered 300,000 PeopleÕs Vote signatures to Downing Street on Monday December 3 at midday. © Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street L to R: Labour MP for Streatham Chuka Umunna, Lara Anne Spirit from PeopleÕs Vote, Christian Broughton, Editor, The Independent, Caroline Lucas, Green Party MP for Brighton Pavilion, Justine Greening, Conservative MP for Putney and Christina Koci-Edwards from PeopleÕs Vote on their way to hand in a petition to Downing Street. Today the IndependentÕs Final Say campaign and PeopleÕs Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa MayÕs Brexit deal. The IndependentÕs editor Christian Broughton delivered over one million Final Say signatures and PeopleÕs Vote spokesman Chuka Umunna MP delivered 300,000 PeopleÕs Vote signatures to Downing Street on Monday December 3 at midday. © Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street L to R: Christina Koci-Edwards from PeopleÕs Vote, Labour MP for Streatham Chuka Umunna ,Christian Broughton, Editor, The Independent, Justine Greening, Conservative MP for Putney, Caroline Lucas, Green Party MP for Brighton Pavilion, Holly Baxter, Co-Editor Independent Voices and Lara Anne Spirit from PeopleÕs Vote. Today the IndependentÕs Final Say campaign and PeopleÕs Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa MayÕs Brexit deal. The IndependentÕs editor Christian Broughton delivered over one million Final Say signatures and PeopleÕs Vote spokesman Chuka Umunna MP delivered 300,000 PeopleÕs Vote signatures to Downing Street on Monday December 3 at midday. © Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young Final Say petition delivered to Downing Street Today the Independentâ€™s Final Say campaign and Peopleâ€™s Vote delivered to 10 Downing Street their respective petitions calling for a public referendum on Theresa Mayâ€™s Brexit deal. The Independentâ€™s editor Christian Broughton delivered over one million Final Say signatures and Peopleâ€™s Vote spokesman Chuka Umunna MP delivered 300,000 Peopleâ€™s Vote signatures to Downing Street on Monday December 3 at midday. Â© Lucy Young 2018 07799118984 lucyyounguk@gmail.com www.lucyyoungphotos.co.uk Lucy Young The Independent/Lucy Young

Three months ago, 43 per cent of Leave voters thought Brexit would make the country’s economy stronger, while just 12 per cent feared it would make it weaker. Today, only 24 per cent of Leave voters say it would make Britain economically stronger, while 26 per cent say it would make the nation weaker.

Amanda Chetwynd-Cowieson, co-founder of campaign group For our Future’s Sake, said young people had helped create a significant shift as momentum grows for a Final Say vote. Some 79 per cent of 18 to 29-year-olds would vote to stay in the EU if another vote is held, according to the YouGov survey of 5,000 voters.

“Young people have always been clear – we believe in having a People’s Vote, and that there is no better deal with the EU than the one we have now,” said Ms Chetwynd-Cowieson.

Theresa May interviews Lord Voldermort in Saturday Night Live sketch about Brexit

“Unfortunately, Labour’s position on Brexit has been anything but clear – putting at risk the futures of millions of young people across the United Kingdom. If they back Brexit, this polls shows that young people may no longer back Labour.”

On Sunday bookmaker William Hill said a second referendum is now the most likely Brexit scenario.