A minister has said he “can understand why people are angry” about allegations that Boris Johnson and his wife Carrie were among around 40 people to attend a drinks event in the Downing Street garden during the UK’s first national COVID lockdown.

Health minister Ed Argar said it is “absolutely right” that Sue Gray – the senior civil servant leading an inquiry into multiple allegations of COVID rule-breaking in Downing Street and other government buildings – looks into the matter, but told Kay Burley “I don’t know what did or didn’t happen”.

In what has been revealed to have been a “bring your own booze” event on 20 May 2020, a Downing Street figure told Sky News that both Mr Johnson and his then fiancée were present.

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Asked multiple times whether if 40 people – including the PM and his wife – had gathered in the Downing Street garden it would have been against the government’s own coronavirus rules, Mr Argar did not explicitly answer the question.

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In spring 2020, when the event allegedly took place, outdoor group gatherings were banned in England.

Mr Argar said it is “not appropriate” to comment on what Sue Gray “may or may not conclude” in her investigation of the Downing Street party allegations.

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Hannah Brady, a spokeswoman for COVID-19 Bereaved Families for Justice, said it made her “sick” to think No 10 staff “partied” in the days after her father’s death.

Put to him that the families of those who have died during the coronavirus pandemic are furious at the latest revelations in the Number 10 “partygate” row, the health minister told Sky News: “We’ve lost 150,230 people to this disease, so I can understand with these allegations that people will be upset and angry”.

The Met Police have confirmed they are “in contact with the Cabinet Office” following the reports of the Downing Street garden drinks party.

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A spokesman for Scotland Yard said: “The Metropolitan Police Service is aware of widespread reporting relating to alleged breaches of the Health Protection Regulations at Downing Street on May 20 2020 and is in contact with the Cabinet Office.”

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Mr Argar told Kay Burley that “what actually happened or didn’t happen in Downing Street is a matter for Ms Gray”, adding that he would not “pre-judge” her inquiry.

“I can understand that with these allegations people will be upset and angry, which is why it’s right that the prime minister asked for that independent investigation to be completed at pace, to get to the facts behind these allegations,” the health minister said.

“[Ms Gray] will come up with her conclusions having interviewed the relevant people, having looked at the evidence and she will then conclude a) what did or didn’t happen, and then b) whether anything that did happen was consistent with the rules.”

Asked if he would have accepted an invitation to the alleged Downing Street drinks party during the first lockdown, Mr Argar said he spent last May “glued to my Zoom screen”.

Earlier on Monday, the prime minister refused to answer a question about whether he and his wife attended a Downing Street party on 20 May.

“All of that, as you know, is the subject of a proper investigation by Sue Gray,” Mr Johnson said.

A Whitehall investigation is already under way into multiple allegations of coronavirus rule-breaking in both Number 10 and other government buildings, which was prompted by initial claims of Christmas parties in Downing Street in 2020.

The inquiry has since been widened to include two alleged events on 15 and 20 May 2020, the latter of which was initially revealed by Dominic Cummings – the prime minister’s estranged former chief adviser.

A leaked email has now emerged from Martin Reynolds – a key aide to the PM – inviting staff to “make the most of the lovely weather” with “some socially distanced drinks”.

According to ITV News, who obtained the email, Mr Reynolds’ message on 20 May was sent to more than 100 employees in Number 10, including the prime minister’s advisers, speechwriters and door staff.

EXCL: Email obtained by @itvnews proves over 100 staff were invited to drinks party in No 10 garden at height of lockdown to “make the most of the lovely weather”.

We’re told PM and his wife attended, with staff invited to “bring your own booze!”https://t.co/rg34EIkdz2 pic.twitter.com/UORlSwwHJX

Around 40 attendees are reported to have gathered in the garden that evening to eat picnic food and drink.

At the time, Britons had only recently been allowed to meet with one person from another household outside as long as they remained two metres apart.

Mixing with multiple households was still banned and groups of up to six people were only allowed to meet outdoors from 1 June.

On 20 May 2020, 363 more people were announced to have died after testing positive for coronavirus.

Oliver Dowden, then culture secretary, used a Downing Street news conference at 5pm that day – an hour before the planned Number 10 drinks event – to tell the public that “the vast majority of people” should be “staying at home as much as possible”.

On the same day, the Metropolitan Police posted a tweet to remind people they could only enjoy being outside if they were on their own, with people they live with, or on their own with one other person from a different household.

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Labour has accused the PM of ignoring the “rules he puts in place for the rest of us”.

Deputy Labour leader Angela Rayner said Mr Johnson “should be ashamed” following further claims of rule-breaking at Number 10, which she described as “despicable”.

Liberal Democrat leader Sir Ed Davey added that Ms Gray’s inquiry “must interview Boris Johnson personally” to get to the bottom of claims of Downing Street parties.

Number 10 would not comment on the leaked email from Mr Reynolds at a time when the inquiry into multiple allegations of COVID rule-breaking in Downing Street and other government buildings is still ongoing.

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