Police are investigating 12 parties in Downing Street and Whitehall, including a birthday gathering for Boris Johnson, according to Sue Gray's report.
The top civil servant revealed she was looking at 16 events in her partygate probe - and 12 of those are being examined by the Metropolitan Police.
Scotland Yard revealed it had been handed 300 pictures and 500 pieces of paper for its probe - and people involved would be contacted by police within weeks.