THERESA May has said MPs must pass vote in favour of a Brexit deal before the Westminster summer recess.

It comes as the UK Government’s continues its talks with Labour despite Tory opposition to Jeremy Corbyn’s central demand.

Last night, the Government said it plans to bring forward key legislation to implement the Brexit withdrawal agreement in the week beginning June 3.

Downing Street said it was now “imperative” the Withdrawal Agreement Bill – the legislation needed to take the UK out of the EU – must be on the statute books before the Commons rises at the end of July.

Her comments will increase speculation that that is the date when May plans to leave No 10 and pave the way for her successor. She is under pressure to outline the timetable for her resignation when she meets the ruling executive of the Tory 1922 Committee tomorrow.

The long-running negotiations between Labour and Tory frontbenchers, aimed at agreeing a compromise Brexit deal, broke up on Monday night with no sign of an imminent breakthrough.

A two-hour discussion on Brexit at Cabinet yesterday heard what areas the Prime Minister is willing to compromise on in the hope of securing Labour’s backing.

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May’s spokesman said: “Cabinet agreed to continue discussions with Labour to see what was possible. However, it was agreed that it is imperative to bring forward the Withdrawal Agreement Bill in time for it to receive Royal Assent by the summer parliamentary recess.”

However, the spokesman refused to say whether Cabinet had unanimously backed the Prime Minister’s approach, which is thought to include a temporary customs arrangement which would see the UK agree to sign up to EU trading rules after Brexit.

That is aimed at meeting Labour halfway on their demand for a permanent customs union.

However, some 13 former ministers, together with the chairman of the backbench 1922 Committee, Sir Graham Brady, have written to the PM urging her not to concede Labour’s demand. The signatories include Gavin Williamson, who she sacked as defence secretary, as well as potential leadership contenders Boris Johnson and Dominic Raab.

The National:

The letter said May could not bind her successor to a deal so any agreement with Labour was likely to be “at best temporary, at worst illusory”.

Shadow Chancellor John McDonnell – who has been part of Labour’s negotiating team – was pessimistic about the talks.

“The situation we are now in is that we’ve been at this five weeks, we haven’t seen the significant shift yet that we require to be able to support the deal,” he said. “The customs union is absolutely key to us.

“However we then get a letter signed by a number of senior Conservatives this morning, Boris Johnson – very likely to be the next leader, he could well be the Prime Minister literally in months – and the situation where he, in his letter, says he’s not going to accept a customs union and actually he will overturn the deal that we negotiate. It gives us no security and we expect a response from the Government on that.”

May’s chief negotiator, Olly Robbins, is in Brussels for two days of talks about the possibility of making changes to the Political Declaration – the document setting out the framework for the future UK-EU relationship after Brexit.

But EU officials insisted there were no negotiations and the EU was still on a “Brexit break”. “We will come out of the Brexit break if there is something happening in London,” European Commission spokesman Margaritis Schinas said.

Meanwhile, a research report has found Scots could be £800 a year worse off if Brexit goes ahead under a Tory-Labour deal.

The study by The National Institute of Economic and Social Research found Edinburgh, Fife and Tayside would be worse hit than any other part of the UK by the proposed deal.