Around 30 people warned over contents of Sue Gray partygate report

British Prime Minister Boris Johnson received one fine (Jonathan Brady/PA)

Around 30 people including British Prime Minister Boris Johnson are being contacted by the Cabinet Office to warn them of the contents of the Sue Gray partygate report.

It is thought that most of the letters were sent out on Thursday, as the Metropolitan Police concluded its investigation into lockdown breaches in Downing Street and across Whitehall.