JEREMY Corbyn yesterday called for Westminster’s opposition parties to come together and “break the Brexit impasse”.

In separate letters to Ian Blackford, Vince Cable, Plaid Cymru’s Liz Saville Roberts and Caroline Lucas of the Greens, the Labour leader asked for a meeting at the “earliest opportunity” to “discuss how we can work together to urgently find and facilitate a consensus in the House of Commons”.

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But the plea confused the other party chiefs, who have been meeting to discuss Brexit for the last two years, as just 24 hours earlier they had asked Corbyn to come and meet them. The Labour leader ignored that request in his letter, which said it was incumbent on Parliamentarians to “do our best work together and find a compromise and a solution that ends the needless uncertainty and worry that the Government’s failed Brexit negotiations have caused”.

Corbyn said his party’s plans for a “permanent customs union, single market deal and dynamic alignment on rights and protections” as a well as “a public vote” would be a “starting point for any discussions”.

He added: “We are keen to see if there is scope to find common ground between our respective proposals”.

In a joint response, Blackford, Cable, Saville Roberts and Lucas said a second Brexit referendum would be key to any negotiations.

In their letter, they said they would “welcome a meeting of the various parties in the House that are supporting a People’s Vote, to coordinate our approach and maximise the chances of success”.

The letter says: “We have been working cross-party since 2016, in particular in relation to a People’s Vote, and would like this item to be at the top of the agenda.”

“We are all agreed that no deal would be a disaster but this is not yet reflected in legislation, and the issue of revocation may well come to the fore in the next few days.

“We believe this must also be a priority in our discussions.”

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The four have asked to meet Corbyn and his shadow Brexit secretary, Keir Starmer, on Monday afternoon.

Blackford said he was glad Corbyn would join the others, “after two years of declining invitations to talk”.

Meanwhile, Brexit Secretary Stephen Barclay has threatened to quit the Government over plans to delay Britain’s departure from the EU.

The Tory was mocked mercilessly on Thursday night when he delivered an impassioned speech in the Commons urging colleagues to support Theresa May’s motion calling for an extension to the Article 50 process – before then promptly walking through the “no” lobby to oppose an extension to the Article 50 process.

If he does quit he will be the third Brexit Secretary to have left May’s Government. David Davis resigned in July and Dominic Raab left the Cabinet in November.

Barclay told the BBC UK should not accept more than a short “technical” extension to Brexit.

European Council president Donald Tusk met Dutch Prime Minister Mark Rutte in The Hague yesterday to discuss whether the EU will be prepared to extend Article 50.

Talks with key bloc power brokers Angela Merkel and Emmanuel Macron will take place on Monday.