The findings of Sue Gray's inquiry into alleged coronavirus rule-breaking across Downing Street and Whitehall are expected to finally be released this week.
The senior civil servant is looking into a series of allegations suggesting that the prime minister and his aides attended parties in breach of regulations put in place to stop the spread of the virus throughout the pandemic.
Mr Johnson has admitted to attending a Downing Street garden party, which he insists he thought was a work event, and a surprise birthday party put on for him in the Cabinet Office, which he only attended "for less than 10 minutes", according to No 10.
