In October 2020, Sir Patrick made a revelation that there was a mistake made when a slide detailing the worst-case scenario for deaths was shown to the public. This came amidst the announcement of a second national lockdown on October 31, 2020. Despite Sir Patrick’s belief that it was a bad idea, Mr. Johnson insisted that the public should see the slide as he had seen it.

However, the Office for Statistics Regulation criticized Sir Patrick for not releasing the data and assumptions behind the worst-case scenario projection of 4,000 deaths per day by December 2020 if no action was taken. This forced Mr. Johnson to make a hasty announcement of the lockdown after the plans were leaked to the media. He spent a considerable amount of time on the phone explaining his reasoning to critics before the press conference.

Despite its scientific validity, Sir Patrick expressed his belief that the 4,000 deaths projection was not a sensible science slide to show. He also noted in his diaries in October 2020 that there were claims by Dominic Cummings, Mr. Johnson’s senior adviser, that “Rishi thinks just let people die and that’s okay.”