deputy Labor leader Angela Rayner will also not receive a fixed fine for attending a campaign event last year, when some pandemic rules were still in effect.
The force said the Labor leader “has no case to answer” about the April 30, 2021 “beergate” meeting, where he was filmed slurping from a bottle in a room with others.
Seventeen Labor MPs and staff members enjoyed drinks and takeaway curry together, but the meeting was “fairly necessary for work,” an investigation found.
At the time, there were social distancing rules — including a ban on mixing indoors between households —.
“Durham Constabulary will not issue firm fines in relation to the meeting and no further action will be taken,” the police said in a statement.
Sir Keir has always urged him to take a break with his team before returning to work at Durham Miners Hall just after 10pm that evening.
Labor staff campaigned for the Hartlepool by-election and Sir Keir was filmed drinking a bottle of beer with colleagues in Mary Foy MP’s offices.
It was later revealed that Ms. Rayner was also at the event, a claim the party had previously denied.
Durham Police added: “A significant amount of documentary and witness evidence was obtained identifying the 17 participants and their activities at that meeting.
“After applying the evidentiary Full Code Test, it has been concluded that the application of an exception, i.e. reasonably necessary work, is not a reason to justify a violation of the regulations.
“The investigation has been thorough, detailed and proportionate.
“The final evidence provided by local constituency participants was returned to Durham Police on July 5 and analyzed by investigators against all evidence before closing the inquiry on July 8, 2022.”
Durham Police initially investigated and found there was no evidence of a breach of the rules but re-examined the matter after the intervention of Richard Holden MP Richard Holden from north west Durham.
Sir Keir has repeatedly denied any breach of the rules, saying his case was different from that of the prime minister who was fined for a birthday party in Downing Street.
After he was acquitted, he tweeted: “I’ve always said no rules were broken while I was in Durham. The police have completed their investigation and agree: there is no case to answer.
“For me this has always been a matter of principle. Honesty and integrity are important. You always get that from me.”
Ms Rayner added: “Integrity is important in politics. The contrast with the behavior of this disgraced Prime Minister could not be clearer.”