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More Britons think Brexit is a bad idea than a good one for the first time since the bombshell referendum, according to a new poll.

The YouGov poll revealed that 45 per cent of voters now agree Britain was wrong to vote to leave the EU, compared to 43 per cent who still think it is the correct decision. A further 12 per cent do not know.

It is the first time a poll has found the majority of people disagreeing with the referendum result.

The poll, published in the Times, found 89 per cent of remain voters still think leaving the EU is the wrong decision, while 85 per cent of leave voters still back quitting.

It comes as Theresa May held "constructive" talks with European Commission president Jean-Claude Juncker on the Brexit process.

The Prime Minister hosted Mr Juncker and Brussels' chief Brexit negotiator Michel Barnier for a working dinner in Number 10 ahead of a summit on Saturday where the leaders of the 27 other EU countries will consider their approach to the talks on the UK's withdrawal.

Downing Street said the Prime Minister used the dinner to reaffirm the UK's commitment to a "deep and special partnership" with the EU after Brexit.

A Number 10 spokesman said: "The PM had a constructive meeting this evening with president Juncker of the European Commission.

"Following the UK's letter of notification under Article 50, she reiterated the UK's commitment to achieving a deep and special partnership with the European Union.

"The PM and president Juncker also discussed a range of other international issues in a useful working dinner."

Meanwhile, Boris Johnson has insisted he stands by his controversial claim that Britain sends £350 million a week to the European Union that could otherwise be spent on the NHS.

The claim - emblazoned on the side of Mr Johnson's campaign bus during last year's EU referendum campaign - was denounced by the official statistician as "misleading" and has since been disowned by senior members of the Brexit campaign.

Immediately after the Leave victory, then UKIP leader Nigel Farage admitted the figure was a "mistake" and said he would not have made the claim.

Challenged over whether he stood by the £350 million claim, Mr Johnson told ITV1's Good Morning Britain: "Of course I do," and insisted the figure was "not disputed".

The YouGov poll questioned 1,590 adults on April 25 and 26.