Police were called to a house party in Islington and issued a fine for the breach of tier 4 rules.
On December 27, officers arrived outside an address at Highbury Quadrant where loud music was being played.
They believed a party, attended by more than 15 people, was taking place at the residence.
While the occupants refused to engage with officers a woman left the address and was issued an fixed penalty notice.
Acting Ch Insp Pete Dearden, from the Met's Central North Basic Command Unit, said: "Thousands of people in London were not allowed to see their loved ones over the Christmas period as the spread of Covid-19 has happened so quickly – partly due to people flagrantly ignoring the rules and attending house parties and accelerating the spread of the disease.
“Anyone seen to be breaking the rules and attending a house party or Unlicensed Music Event can expect to be fined by the police.”
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