More than a year after Britain voted to leave the European Union, I realise we who ended up on the Leave side have probably made a mistake. No, not that we should have voted the other way, but that we thought we had won the argument last year during those weeks when we lived and breathed every detail of the debate. To some extent we then stopped making the case. The Remainers didn’t.

True, they have a few new arguments to deploy, such as that Michel Barnier is a wizard negotiator who will run rings round us and that everything he says is gospel, while everything David Davis says is nonsense; even that it is now obvious that “the job can’t be done” (in Lord