British Prime Minister Boris Johnson’s staff were invited to a “bring your own booze” party in the garden of his Downing Street residence during the first nationwide coronavirus lockdown in 2020, according to a leaked email seen by broadcaster ITV.

Mr Johnson, who won a landslide victory in a 2019 election, has faced a barrage of criticism about alleged parties in government offices, including his own, in breach of COVID-19 rules.

About 40 staff gathered in the garden for the drinks party, including Mr Johnson and his wife Carrie, ITV said, even though at the time social mixing between households was limited to two people outdoors.

An email was sent by the Mr Johnson’s principal private secretary Martin Reynolds to more than 100 employees in Downing Street on May 20, 2020, ITV said.

“After what has been an incredibly busy period, it would be nice to make the most of the lovely weather and have some socially distanced drinks in the No.10 garden this evening,” Mr Reynolds said in the email.

“Please join us from 6pm and bring your own booze!”

Mr Johnson’s office has declined to comment.

At the time, schools were shut to most pupils, and pubs and restaurants were closed, with strict controls on social mixing. Two people from separate households were allowed to meet outdoors but only if they maintained a distance of two metres.

The opposition Labour Party accused Mr Johnson of having “no regard for the rules he puts in place for the rest of us”.

Senior government official Sue Gray is investigating allegations that at least five parties were held in government departments last year during COVID-19 lockdowns.

Mr Johnson’s former chief adviser Dominic Cummings claimed last week that a drinks party had been held in the Downing Street garden in May 2020, despite warnings by him that it was against the rules.

When the Prime Minister was asked earlier on Monday if he and Carrie Johnson had attended the event, he declined to answer, saying: “All that, as you know, is the subject of a proper investigation by Sue Gray.”

The allegations of officials holding events in breach of the government’s own lockdown rules, including a Christmas party, have dismayed voters who were told by the government to carefully stick to social distancing rules.

Mr Johnson, 57, has faced criticism in recent months about his handling of a sleaze scandal, the awarding of lucrative COVID contracts, the refurbishment of his Downing Street flat and a claim he intervened to ensure pets were evacuated from Kabul during the chaotic Western withdrawal in August.

Mr Johnson’s Conservatives have lost their poll lead over the Labour Party and last month suffered an election defeat in a historic stronghold, stepping up pressure from his own MPs to reform his team of advisers.

Britain’s official death toll from the COVID-19 pandemic rose above 150,000 on Saturday.