A former senior adviser to Boris Johnson who claims the British prime minister knew a party was being held at his residence during a Covid-19 lockdown will be questioned by an official investigation into the allegations, the Mirror reported.

British media have reported that at least 11 gatherings took place at 10 Downing Street — the prime minister's official residence and office — or in other government departments between May 2020 and April 2021, when Covid-19 rules limited how many people could meet socially. An internal investigation is being carried out to establish the facts.

Dominic Cummings, an architect of Britain's departure from the European Union and a former senior adviser to Johnson who left government under acrimonious terms in November 2020, will be interviewed by Sue Gray, a senior government official who is carrying out the investigation, the Mirror said.