LABOUR MP Ian Murray has launched a scathing attack on Jeremy Corbyn and Richard Leonard saying the leaked UK Government economic assessments about the effects of leaving the EU prove Labour’s “jobs first Brexit” is impossible.

The former shadow Scottish secretary hit out after a secret report concluded that the UK would be worse off regardless of whether it departed the bloc via a soft Brexit or a hard one.

Civil servants reported that even if London can negotiate a comprehensive free trade agreement with the EU, economic growth would be five per cent lower over the next 15 years than if the UK were to stay in the EU. If the UK was to crash out without a deal, a so-called hard Brexit, and relies on the World Trade Organisation rules, then growth would reduce by eight per cent.

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Even, a soft Brexit, where the UK would remain in the single market through membership of the European Economic Area – a scenario ruled out by both the UK and Scottish Labour leadership as well as the UK Government – growth would be down by two per cent.

Responding to the report, and ongoing comments by the Labour leadership that they are seeking a “jobs first Brexit”, the Edinburgh South MP told The National: “The truth is out. There can be no good outcome that involves leaving the EU, just varying degrees of bad ones.” Murray said that “there is nothing inevitable about Brexit” and called on politicians and Remain campaigners” to “find a reverse gear and fast”.

He added: “This document is further proof that the idea of a ‘jobs first’ Brexit is a contradiction in terms. There is no bespoke deal waiting to be pulled out of the lucky bag. The Government is trying to pull a fast one. It is time for Parliament and voters to wise up.”

Last night the UK Government said it would release the assessments to MPs, though with redactions if it was thought they could affect the UK-EU negotiations.

The development followed a debate called by Labour in which it demanded the publication of the documents.

Speaking of the decision to allow MPs to read the reports, the junior Brexit Minister, Robin Walker, said elements would be redacted if they could affect negotiations with the EU, and only MPs would be able see the studies in a confidential reading room.

The climbdown over the public-ation of the papers mirrors what happened last year when Labour sought and won an opposition day motion calling for the release of a wider set of Brexit analyses, which turned out later to be sectoral assessments.

The findings of the Brexit impact assessments, which were leaked to the website BuzzFeed news on Tuesday, were also taken up by the SNP’s Westminster leader Ian Blackford at Prime Minister’s Questions.

He accused the UK Government of being “prepared to make everyone poorer” and called for leadership over Brexit. Cabinet Office Minister David Lidington told Blackford Britain would leave the single market and customs union as “a matter of legality” and that Theresa May wanted to negotiate a new partnership with the EU to continue frictionless trade.

“I must say I’m surprised at the minister because there’s not a question of legality. We’re going to be in a transitional deal, we’ll still be in the single market with the EU,” Blackford said.

“This is a Government in crisis and an international embarrassment. The Chancellor, the Scottish Secretary, the Scottish Conservatives, the Home Secretary have all supported membership of the single market.

“Despite this, the Government is still prepared to make everyone poorer. Where is the leadership?”

Later, former Tory chancellor Ken Clarke accused the Government of adopting a “cult of secrecy” during a debate, called by Labour, on the Brexit economic assessments.

Europhile Clarke, who has repeatedly rebelled against his party over leaving the EU, asked Labour’s Brexit spokesman Sir Keir Starmer whether “we have a rather curious cult of secrecy across Government today, and have had for some years?”

He added: “A properly open government should make that sort of information freely available to all those, including MPs, with a legitimate interest in the subject.”

Despite commissioning the study, ministers dismissed the findings as incomplete, saying it does not include the option of the sort of bespoke deal sought by May.