A “bring your own booze” party in the No 10 garden is the latest in a string of allegations of gatherings held across the Government while coronavirus restrictions were in place.

Here is a list of what has been reported so far.

– May 15, 2020: Downing Street garden party

Boris Johnson, his wife Carrie, former chief adviser Dominic Cummings, and Mr Johnson’s principal private secretary Martin Reynolds were all pictured, in a photograph leaked to The Guardian, sitting around a table in the No 10 garden, with wine and cheese in front of them.

Some 15 other people were also in the photograph, but the Prime Minister has insisted this was a work meeting, saying: “Those were meetings of people at work, talking about work.”

– May 20, 2020: BYOB garden party

The latest revelation came in an email, leaked to ITV, from Mr Reynolds to more than 100 Downing Street employees asking them to “bring your own booze” for an evening gathering.

Multiple reports have suggested the Prime Minister attended the event with his wife.

– November 13, 2020: A leaving party for senior aide

According to reports at the time, Mr Johnson gave a leaving speech for Lee Cain, his departing director of communications and close ally of Mr Cummings.

– November 13, 2020: Johnsons’ flat party

There are allegations that the Prime Minister’s then fiancee hosted parties in their flat, with one such event said to have taken place on November 13, the night Mr Cummings departed No 10.

A spokesman for Mrs Johnson has called the claim “total nonsense”.

– November 25, 2020: Treasury drinks

A Treasury spokesperson told The Times a number of staff had come into the office to work on the Spending Review.

They said: “We have been made aware that a small number of those staff had impromptu drinks around their desks after the event.”

– November 27, 2020: A second staff leaving do

The Mirror reported that the Prime Minister gave a farewell speech to an aide at the end of November while the lockdown in England was still in place.

Other reports have said the leaving do was for Cleo Watson, a senior Downing Street aide and ally of Mr Cummings.

– December 10: Department for Education party

The DfE confirmed a social event had happened after The Mirror reported former education secretary Gavin Williamson threw a party and delivered a short speech at an event organised at his department’s Whitehall headquarters.

A spokesman acknowledged that “it would have been better not to have gathered in this way at that particular time”.

– December 14: Party featuring Tory London mayoral candidate Shaun Bailey and staff

Shaun Bailey apologised “unreservedly” for attending the gathering at Conservative Campaign Headquarters (CCHQ) organised by staff on his campaign team.

“It was a serious error of judgment at a time when Londoners were making immense sacrifices to keep us all safe and I regret it wholeheartedly,” he tweeted.

He quit his role chairing the London Assembly’s police and crime committee after The Mirror published a picture showing him at the gathering.

– December 15: Downing Street quiz

The Prime Minister appeared on contestants’ screens at the quiz but insisted he broke no rules.

An image published by the Sunday Mirror showed the Prime Minister flanked by colleagues, one draped in tinsel and another wearing a Santa hat, in No 10.

Downing Street admitted Mr Johnson “briefly” attended the quiz after the photographic evidence emerged but insisted it was a virtual event.

– December 16: Department for Transport party

The Mirror reported senior civil servants were “boozing and dancing” at the event, allegedly planned by staff from Transport Secretary Grant Shapps’ office.

A DfT spokesman said: “Fewer than a dozen staff who were working in the office had a low-key, socially distanced gathering in the large open-plan office after work on December 16, where food and drink was consumed. We recognise this was inappropriate and apologise for the error of judgment.”

– December 17: Cabinet Office “Christmas party!”

A number of outlets reported that a gathering was held in the Cabinet Office on December 17.

The Times reported that Cabinet Secretary Simon Case attended the party in room 103 of the Cabinet Office, that it had been organised by a private secretary in Mr Case’s team, and that it was included in digital calendars as “Christmas party!”.

The Cabinet Office confirmed a quiz took place, but a spokesperson said: “The Cabinet Secretary played no part in the event, but walked through the team’s office on the way to his own office.”

– December 18: Christmas party at Downing Street

The claim which kicked off the rule-breaking allegations is that a party was held for Downing Street staff on December 18.

Officials and advisers reportedly made speeches, enjoyed a cheese board, drank together and exchanged Secret Santa gifts, although the Prime Minister is not thought to have attended.

Mr Johnson’s spokeswoman Allegra Stratton quit after being filmed joking about it with fellow aides at a mock press conference.