A landmark report has found former UK prime minister Boris Johnson deliberately misled parliament over boozy parties during COVID-19 lockdown.

The long-awaited findings of the Privileges Committee were published tonight (Thursday morning local time).

The committee spent 14 months investigating Johnson's conduct over "partygate", a series of boozy gatherings in his office that broke strict COVID-19 restrictions that his government had imposed on the country.

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The committee found that Johnson's actions were such a flagrant violation of the rules that they warranted a 90-day suspension from parliament. While a damning indictment of the former prime minister's conduct, the recommendation is largely symbolic because Johnson angrily quit as an MP on Friday after the committee informed him of its conclusions.

Johnson, 58, described the seven-member committee — which included both the ruling Conservatives and opposition party members — as a "kangaroo court", and accused political opponents of driving him out in a "witch hunt".

"The committee now says that I deliberately misled the House, and at the moment I spoke I was consciously concealing from the House my knowledge of illicit events," Johnson said in a heated statement released in response on Thursday.

"This is rubbish. It is a lie. In order to reach this deranged conclusion, the Committee is obliged to say a series of things that are patently absurd, or contradicted by the facts."

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