Most people want Britain to stay in the EU single market after Brexit , a huge survey reveals.

The study of more than 200,000 people says 56% want Britain to stay part of the single market - despite both Jeremy Corbyn and Theresa May promising to leave it.

And 52% believe Britain would be better off economically overall inside Europe.

The survey also claims Leave voters would be twice as likely (8%) as Remain voters (4%) to change their minds if there was a second referendum next week.

Mirror analysis suggests this could give Remain a narrow lead of 51% to 49% in a second vote.

But the proportion of voters who remain unsure is still bigger than the gap between Leave and Remain - meaning the very close outcome could still go to Leave.

Whichever way they voted, our survey found readers are fed up with the progress of Brexit talks between the UK and Brussels.

Many EU nationals face having to apply to continue living in the UK legally after Brexit (
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Some 62% of all respondents were unhappy with the progress of talks, while just 18% are happy and 20% are not sure.

Even Leave voters were far more likely to be unhappy (46%) than happy (31%) with less than a year to go to Brexit Day in March 2019.

Remain voters overwhelmingly (76%) said they were unhappy with the progress of talks, with just 8% declaring themselves happy.

The survey was completed online by 216,800 people who visited the websites of three news publishers: Johnston Press, Newsquest, and Trinity Mirror, which owns the Daily Mirror.

It was run in partnership with Google Surveys and is thought to be the largest Brexit survey of its kind to date.

It found 56% of respondents said Britain should remain part of the European single market, with 28% saying Britain should leave and 16% not sure.

Those opting to stay in the single market were 83% of Remain voters and 22% of Leave voters.

Theresa May has promised we are leaving the EU single market (
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...and so has Jeremy Corbyn (
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REX/Shutterstock)

Overall, 52% of respondents said they believe Britain will be better off economically inside Europe. 35% said we are better off outside and 13% said not much will change.

Those figures changed dramatically depending on how people voted. 85% of Remain voters thought Britain better off inside Europe - compared to 9% of Leave voters.

One in eight Leave voters aged between 18 and 24 (12%) said Britain would be better off economically inside Europe, while it was one in 10 among those aged 25 to 44.

In comparison, just 7% of Leave voters aged 65 and over think Britain will be better off economically inside Europe, with 82% saying it will be better off outside.

Similarly, three in 10 Leave voters aged 18 to 34 believe we should still be part of the Single Market, compared to just under a fifth (18%) of those aged 65 and over.

Those living in Scotland were most likely to say Britain would be better off economically inside Europe, at 63%, including 13% of Leave voters.

Those in the North East, Yorkshire and the Humber and the East Midlands were the most likely to say Britain will be better off outside, at 40% each.

Labour MP Alison McGovern speaks in the House of Commons, London, as MPs gather to pay tribute to Labour MP Jo Cox (
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Among those completing the survey 8,200 readers in Northern Ireland, 67% of whom said customs checks would not be acceptable on the border with the Republic. That fell to 34% for Leave voters, rising to 85% for those who voted Remain.

Pro-EU campaigners seized on our figures.

Labour MP Alison McGovern, co-chair of Labour Campaign for the Single Market, told the Mirror: “These figures just go to show that no one should say that the Brexit issue is settled.

“There is a clear appetite for us to stay in the single market, now that more is known about the impact of Brexit.

“In last year’s general election no one’s manifesto won out and we were left with a hung Parliament. The Tories cannot claim a mandate for their version of Brexit, and I would encourage them to listen to the public.”

Labour's MP Frank Field - who voted for Brexit - said leaving the single market would leave Britain following EU rules and powerless to control free movement (
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Francis Grove-White, deputy director of pro-EU group Open Britain, demanded a second vote over Brexit in light of the survey.

He said: “The only way we can truly hold politicians to account on Brexit is if the public are allowed to express their view through a People’s Vote.”

But Frank Field, one of a handful of Labour MPs who voted for Brexit, said leaving the single market would leave Britain following EU rules and powerless to control free movement.

He added: “I’m in favour of us negotiating a Free Trade Agreement so we’re not tied by the restrictions of the single market.”