At least 30 more fixed penalty notices will be issued by the ACRO Criminal Records Office, the Metropolitan Police said in its latest update on Operation Hillman, which is looking into breaches of Covid-19 regulations.
This is up from the 20 referrals the force said had been made at the end of March.
Scotland Yard said it was “making every effort to progress this investigation at speed”, with the possibility of more fines to come.
Previously, Sheffield Council have said they are unaware whether chief executive Kate Josephs is one of the individuals to have been fined, following a gathering for her departure from the civil service in 2020.
Before heading up the Yorkshire council, Ms Josephs was the head of the Covid Taskforce at the Cabinet Office, who were responsible for drafting the lockdown legislation.