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The Brexit Secretary faced calls to resign today after admitting he has not done ANY impact assessments of Brexit .

David Davis is accused of misleading Parliament after he utterly contradicted his own boast - just six weeks ago - that he had impact assessments in "excruciating detail".

Today he claimed there are no formal impact assessments because he's "not a fan" of them and "they have all proven wrong" in the past.

He said the government will simply "do the best we can to quantify" how different Brexit options hit the economy "at some stage".

Mr Davis' astonishing comments came despite Labour waging a battle for months to obtain 58 studies into different sectors of the economy.

MPs voted to release the studies, and they were given to MPs in private - not the public - with key sections blacked out.

Asked about the "impact assessments" in October, Mr Davis did not challenge the phrasing and replied: "[Theresa May] will know the summary outcomes of them... They are in excruciating detail."

Yet today he said the studies, which filled two lever arch files, are simply "sectoral analyses" of key bits of the economy without showing how Brexit will affect them.

Labour MP David Lammy accused Mr Davis of "blatant lying", adding: "He must surely now resign. He simply can not be allowed to go around lying to Parliament and the British public in this way. Mendacious, conceited, vain, duplicitous, wholly unfit for office."

Mr Lammy has contacted Commons Speaker John Bercow to seek advice on beginning contempt proceedings against Mr Davis and other ministers he believes have misled Parliament.

Speaker Bercow confirmed he could investigate whether Mr Davis was in contempt of Parliament - an offence which used to get MPs locked up in Big Ben's bell tower.

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Labour MP Chuka Umunna warned there was "strong evidence that perhaps this house has been misled on this issue."

Lib Dem MP Tom Brake said Mr Davis may have "repeatedly inadvertently misled the House."

Speaker Bercow replied: "if any member believes a contempt of the house has taken place, the proper approach is for that member to write to me privately.

"I’m not going to make an assessment and pronounce now. I will look at it."

He said he would only consider the issue after the Brexit Committee, where Mr Davis was appearing, completes its own deliberations.

As scores of Twitter users called for Mr Davis to quit, author JK Rowling added: "There is no swearword in the English language big enough to do justice to my feelings at this moment."

Eloise Todd of pro-Remain group Best For Britain said: "David Davis has repeatedly lied to Parliament about these impact assessments. He is treating Parliament with utter and total contempt. No minister of the crown should be able to wilfully mislead people like he has. He should consider his position today."

The dramatic admission came at a hotly-anticipated meeting of the Brexit Committee in Parliament today.

Asked if there were impact assessments on agriculture or aviation, Mr Davis said: "I think the answer’s going to be no to all of them."

He added: "You don’t need to do a formal impact assessment to understand if there is a regulatory hurdle between our producers and the market, it will have an effect.

"I’m not a fan of economic models because they have all proven wrong."

He said Brexit was a "paradigm shift" and compared it to the financial crash of 2008, when all the models were wrong.

"The Queen famously asked 'why did we not know'," he said.

He added: "We will at some stage do the best we can to quantify the effect of different negotiating outcomes as we come up to them."

Mr Davis claimed impact assessments were not necessary yet because he's still waiting for the EU to authorise future trade talks.

(Image: REX/Shutterstock)

But Brexit committee chair Hilary Benn asked how he could wait so long when he had wanted to kick-start trade talks back in October.

Mr Davis replied: "The usefulness of such a detailed impact assessment is near zero."

He said the sectoral studies were evolving with time and had already been redrafted three times.

He added: "Do not draw the conclusion that because you’ve used the word impact, you have an impact assessment."

Lib Dem MP Wera Hobhouse said: "Whether it’s through incompetence or insincerity, it’s now clear David Davis has been misleading Parliament from the start.

“Claims that these papers were commercially sensitive or an analysis of Brexit's impact have been revealed to be complete fabrication.

“In fact, it seems they didn’t even exist in any form until Parliament ordered them to be published."

Eloise Todd, chief executive of pro-Remain group Best for Britain, blasted the claim that impact assessments were proven wrong.

"This is David Davis at his most Luddite and expert bashing," she said.

Tim Roache, GMB General Secretary, added: "It’s remarkable that Ministers have decided that they haven’t done Brexit impact assessments after all.

“That’s not what they’ve been telling us for the last few months, so either they’ve been leading us up the garden path or they’re playing fast and loose with people’s livelihoods, communities and the economy. It’s unforgivable recklessness."