Officials have been handed the first £50 Partygate fines today reportedly relating to a leaving do during the first lockdown.
The Metropolitan Police confirmed this week that 20 fixed penalty notices would be issued over law-breaking gatherings in Downing Street and Whitehall during the pandemic.
Detectives have been investigating 12 parties, including six events Boris Johnson is believed to have attended.
The first tranche of fines are understood to be for the most straight forward cases, with the Prime Minister's file believed to be at the "bottom of the pile".
Police have refused to name anyone involved or to confirm which parties involved law-breaking.
But reports have emerged that the fines are linked to a leaving bash held in the Cabinet Office on June 18 2020 for No10 official Hannah Young, who quit to become deputy consul general in New York.
The event, which was held during the first Covid lockdown, was first revealed by Whitehall enforcer Sue Gray in her initial report on Partygate in January.
Around 20 people were said to have attended the boozy event, which took place when indoor social gatherings were banned in England.
ITV's Robert Peston said officials attending this party had received £50 fines by email on Friday.
Downing Street has said it won't name anyone slapped with a fixed penalty notice, unless the Prime Minister or civil service chief Simon Case get a fine.
No10 and Boris Johnson have so far refused to say laws were broken - despite police saying fines would be issued for Covid law-breaking.
Two Cabinet Ministers - Deputy PM Dominic Raab and Trade Secretary Anne-Marie Trevelyan - have publicly accepted that the fines mean police believe law-breaking took place.
Today, Policing Minister Kit Malthouse also appeared to accept that the fines mean police have ruled the law was broken at Downing Street gatherings.
Speaking to BBC Breakfast, Mr Malthouse said: "A fixed-penalty notice means police have a reasonable belief that you've broken the law - you still have a right to challenge it if you want.
"Having said that, the police practice is not routinely to release the names of those who receive fixed penalties, and I don't see why that rule should be waived for those people who may or may not be in receipt of it in Downing Street."
Downing Street was approached for comment.
On Thursday, the PM's official spokesman said: "The facts are not in dispute.
"We have been clear that mistakes were made, the Prime Minister believes it is right to respond once the full facts are known, once the investigation has concluded."
