D ominic Cummings’s reputation rests above all on the Vote Leave slogan on the side of the bus: “We send the EU £350m a week.” The Remain side were driven into a fury, denouncing it as untrue, which it was, but the more they denounced it the more they drew attention to one of the core Leave arguments.

Because Cummings’s Leave campaign won the referendum, he was regarded as a tactical genius – and his reputation was sealed by being portrayed by Benedict Cumberbatch in the docudrama of the campaign.