As each day passes a new snippet of detail, via an interview with a former aide or a passing comment by an old colleague, sheds more light on how David Cameron came to call and subsequently lose the Brexit Referendum. What is emerging is not a picture of political confidence and astuteness.

At every opportunity Mr Cameron is at pains to tell us he has no regrets about calling the referendum and his former aides explain how he felt he had no option but to do it. The case does not become more persuasive for being repeated. The former Prime Minister’s memoirs are due out later this year but it is hard to see how anything he might say will do anything to lighten the sense of failure that crushes his political reputation.

This week Theresa May made yet another valiant attempt to sort out the chaotic political legacy she inherited and to avoid a similar political fate to her predecessor.