Police are taking no further action over a photo of Keir Starmer having a beer last April.
The Labour leader was pictured drinking indoors with colleagues just before last year's local elections in the Durham force area.
Last night, they confirmed that no further action was being taken with regard to the incident. "We have reviewed the case," said a Durham Police spokesman.
"We have determined that no laws were broken and no further action will be taken in this matter."
The move followed demands from various Tory MPs following the scandal involving Boris Johnson and the No 10 lockdown Christmas party first revealed by the Mirror.
David Morris, Tory MP for Morecambe, claimed in a Commons debate that there was 'no difference' between what Boris Johnson and Sir Keir had been accused of.
And Alexander Stafford, Tory MP for Rother Valley, said there should be no 'hypocrisy' and that 'all sides need to be investigated'.
He told MPs: 'Those in glass houses should not throw beer bottles.'
Sir Keir was pictured drinking a bottle of beer in a Durham constituency office with other Labour campaigners in April last year, days before the local elections.
At the time, England was in 'step two' of the roadmap out of lockdown.
The Labour leader came under fire as Johnson was increasingly criticised for a number of parties held at No.10.
Sir Keir said: “I was in a constituency office days before the election, we were very busy, we were working, at some time some food turned up.
“We stopped, we had our food and then we carried on working. That is not a breach of the rules, it’s not a party and it’s no comparison to the Prime Minister.
"It was perfectly lawful to meet for work, which is what we were doing.
“The party that was put to the Prime Minister on Wednesday happened because an invitation was sent to 100 people saying 'let's have some socially distant drinks in the garden and bring your own booze'.
Asked where he draws the line, the Labour leader replied: “The line is drawn in the rules - and the Prime Minister broke the rules”.
