Britain's Secretary of State for Exiting the European Union (Brexit Minister) David Davis | Ben Stansall/AFP via Getty Images David Davis: UK government did not do impact assessment of Brexit The Brexit secretary said an impact assessment was not required to know that putting “a regulatory hurdle” between producers and a market would have an effect.

LONDON — The U.K. government has done "no systematic impact assessment" on different sectors of the economy of leaving the European Union, Brexit secretary David Davis told MPs Wednesday.

Davis was called before the exiting the European Union select committee after MPs were unhappy with the "sectoral analysis" handed over to the committee by the government following a binding vote by MPs.

The Treasury had a "pretty crude" Office for Budget Responsibility forecast, Davis said, but he confirmed the government had not undertaken any impact assessments for the implications of leaving the EU for different sectors of the economy.

Asked specifically about whether there were impact assessments for the automotive, aerospace and financial services, Davis said: "I think the answer is going to be no to all of them."

Davis told MPs: "You don't need to do an impact assessment, a formal impact assessment to understand that if there is a regulatory hurdle between our producers and a market that it will have an impact, it will have an effect. The assessment of that effect, I think I have said to you before, is not as straightforward as people imagine."

"I am not a fan of economic models because they have all proven wrong. When you have a paradigm change, as happened in 2008 when you had the financial crisis, all the models were wrong. In fact, the Queen famously asked 'why did we not know?' Similarly what we are dealing with here, in every outcome, whether it is a free trade agreement, whether it is a WTO [World Trade Organization] outcome or something in between on those spectrums, it is a paradigm change, so we know in terms, not the scale, not the size, but the order of magnitude of impact."

But Davis indicated that the government would "at some stage" do the best it can to "quantify the effect of different negotiating outcomes as we come up with them."

"In particular we will try and assess, in bigger categories, the effect of various outcomes in financial services, we will try and assess the effect of various outcomes in terms of the overarching manufacturing industry, agriculture and so on. We will do that a little close to the negotiating timetable," he added.

But he told MPs they would be "negotiation sensitive," and they would not be published. "When they come, I can tell you they are there, but I can't give them to the committee at that point," he added.