British Prime Minister Boris Johnson has rejected calls to resign as he waited for an official report into gatherings at Downing Street during Covid-19 lockdowns.

He insisted he was "getting on with the job", although he acknowledged there were people who "want me out of the way" for a variety of reasons.

Mr Johnson appeared at Prime Minister's Questions with his future in the balance as Westminster awaits the release of senior official Sue Gray's report into parties held during lockdown in No 10 and Whitehall.

The report is expected to be handed to Downing Street today, although it had not been submitted by the time Mr Johnson stood up to face MPs.

But an indication of how damaging the report could be for the government came when Scotland Yard chief Dame Cressida Dick announced a police inquiry was being carried out, based in part on evidence obtained by the Gray investigation.

Labour leader Keir Starmer suggested Mr Johnson had misled parliament about Downing Street parties, something which would normally require a minister to resign.

Asked if he would now quit, the Prime Minister said: "No."

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Mr Starmer said: "We now have the shameful spectacle of a Prime Minister of the United Kingdom being subject to a police investigation, unable to lead the country, incapable of doing the right thing and every day his Cabinet fail to speak out they become more and more complicit."

He challenged the Prime Minister to publish the full Gray investigation report as he receives it - Mr Johnson said he would "do exactly what I said", although there has been speculation the version published could be redacted or edited.

The Prime Minister is also committed to giving a Commons statement in response to the Gray report.

Mr Starmer said: "Whatever he says in his statement later today or tomorrow won't change the facts. Isn't this a Prime Minister and a government that have shown nothing but contempt for the decency, honesty and respect that define this country?"

Mr Johnson replied: "Of course he wants me out of the way - he does, and of course I don't deny, for all sorts of reasons, many people may want me out of the way."

But he said Mr Starmer wanted him out because "he knows that this government can be trusted to deliver".

He added: "We're - and in particular I - am getting on with the job."

Metropolitan Police Commissioner Cressida Dick said investigations into historic allegations of Covid regulation flouting were carried out in cases of the "most serious and flagrant" breaches, and when it was considered those involved "ought to have known that what they were doing was an offence".

Northern Ireland minister Conor Burns defended Mr Johnson's presence at a surprise birthday bash in the Cabinet room on 19 June 2020 when social events indoors were banned, saying he had been "ambushed with a cake".

Mr Burns said it was "not a premeditated, organised party", adding: "They came to his office with a cake, they sang Happy Birthday, he was there for 10 minutes.

"I don't think most people looking at that at home would characterise that as a party."