Here we go again. The sorry saga of the impact assessments continues. First, David Davis was telling MPs about the “excruciating detail” of the government’s impact assessments.

After parliament passed a binding motion calling for these documents to be published he changed tack and said no “economic forecast” ever existed. And then on Monday night, documents were leaked revealing assessments do exist.

It was absurd for ministers to ever claim that they were taking the biggest decision in our country’s recent history without any evidence whatsoever. For David Davis to go blind into the negotiations with the EU would have been wrong in principle and a derogation of duty.

But what is even more absurd is the fact that the government is now refusing to