Voters want Boris Johnson to go to prison if he breaks the law by refusing to seek a delay to Brexit and say he “probably acted improperly” over his links to the entrepreneur Jennifer Arcuri.

Yet, despite one of the most turbulent weeks endured by a prime minister in modern times, a YouGov poll for The Sunday Times today puts the Tories on 33%, 11 points ahead of Labour, with the Liberal Democrats on 21% and the Brexit Party trailing on 13%.

The poll is not all good news for the prime minister, whose approval rating has slipped since the start of September. Now 36% of voters think Johnson is competent, down from 41% at the start of the month, while the number who