GORDON Brown has predicted there will be a second Brexit referendum, becoming the third former Prime Minister to back the idea of a People’s Vote.

Mr Brown said he believed the people would “have the final say” on the matter, and warned of a deeply divided country without one.

However he did not say if it would be before March 2019, and suggested the EU could leave the door open to the UK returning.

His intervention, which echoes those of Tony Blair and Sir John Blair, was seen as a blunt rebuke to the current Labour leader.

On Friday, Jeremy Corbyn said Brexit could not be stopped, despite the Labour conference voting in September to keep all options on the table in the event of a crisis.

Mr Corbyn’s remarks forced Shadow Foreign Secretary Emily Thornberry and Shadow Brexit Secretary Sir Keir Starmer to contradict him, and say Brexit could be stopped though a People’s Vote, if Labour’s did not secure its preferred option of a general election.

In a lunchtime speech at the Institute for Government in London, Mr Brown also corrected Mr Corbyn, whose position dismayed many Labour supporters.

Mr Brown said: “I think there will be a second referendum.

“I believe that, in the end, the situation will have been seen to have changed since 2016 and that the people should, in the end, have the final say.”

He said voters were "being asked to deal with a new situation that has arisen" and argued "none of the major issues are resolved".

He told his audience: "The world has actually changed since 2016. "There will be a referendum at some point... the people have got a right to have a final say."

He also speculated the Article 50 withdrawal process might be extended beyond next March.

He warned the current situation risked leaving all parts of society feeling betrayed, creating a backlash against the political establishment that could be exploited by political extremists.

He said: “I fear a sense of betrayal will increasingly take root on all sides.

“Millions of young people who want to remain, feeling betrayed that their future is being mortgaged by an older generation.

“Remain voters feeling betrayed because the European referendum was won, in their view, on the basis of dishonest propaganda and in the view of the Electoral Commission by corrupt electoral practises.

“Leave voters feeling that pledges made at the referendum are not being delivered; for example the promises of being better off, of more money for the NHS, of absolute freedom for the fishing industry and of how easy a clean break would be.

“Most of all, Leave voters feeling the promise that their voices would finally be listened to - one of the main reasons they rebelled against the advice of their leaders - is not being honoured.

‘It is time to act to prevent this continuing descent into a toxic future and the allegations of ‘betrayal’ from all sides -an atmosphere that is fertile ground for populist politicians.”

He also called for a Royal Commission to allow the public to air their views on Brexit in a series of consultations, saying it should include changing the migration regime.

He said: “It would encourage a national conversation by organising deliberative hearings around the country that listen to the concerns of the public about the causes and consequences of Brexit and their aspirations for the future

“And it would engage us in a dialogue about the difficult issues from migration to sovereignty and our long-term economic future, empowering all voices to be heard.”

Mr Brown’s comments came amid growing turmoil at the top of government, with cabinet splits being aired in public over Theresa May latest Brexit plans.

Despite UK government desperation to strike a deal by Wednesday to avoid costly No Deal contingency measures being activated, her plan was rejected at home and abroad.

Remainer Jo Johnson, who quit as transport minister on Friday, accused Mrs May of “calculated deceit” by hiding the scale of the damage Brexit would cause.

Meanwhile his brother, the former Foreign Secretary Boris Johnson, urged members of the cabinet to “mutiny” against a Plan that would keep the UK in “captivity”.

Mrs May’s plan on the Irish backstop, an insurance policy against the return of a hard border in the event of No Deal, is a temporary UK-wide customs union.

Mrs May wants a joint mechanism with the EU to decide when to end the arrangement, bur Brussels has so far refused, while Brexiters insist the UK must be able to quit unilaterally.

With both Remain and Brexiter Tory MPs reported to be losing faith in Mrs May’s plan, tomorrow’s cabinet has been billed as ‘judgment day’ for ministers on the brink of quitting.

Remain-backing MP Dominic Grieve said he was picking up a “sea change” in the mood of back-benchers against the PM’s proposals.

Penny Mordaunt, the Leave supporting International Development Secretary, warned the Cabinet could block a bad deal: “The important thing is there’s two checks on this deal, there’s Cabinet and there’s Parliament.”

Despite Brexit talks on Sunday lasting until 2.45am on Monday, EU chief negotiator Michel Barnier told the leaders of the EU27 nations there was still breakthrough.

“Intense negotiating efforts continue, but an agreement has not been reached yet,” he said.