Boris Johnson, the former premier, had arrived around three hours early for the proceedings.
Boris Johnson on Wednesday apologised for "the pain and the loss and the suffering" caused by the Covid-19 pandemic, as he began giving evidence at a public inquiry into his government's handling of the health crisis.
The former prime minister, who has faced a barrage of criticism from former aides for alleged indecisiveness and a lack of scientific understanding during the pandemic, is facing two days in the witness box.
Boris Johnson, who was forced from office last year over lockdown-breaching parties held in Downing Street during the pandemic, accepted that "mistakes" had "unquestionably" been made.
"I understand the feeling of the victims and their families and I'm deeply sorry for the pain and the loss and the suffering to those victims and their families," Johnson said.
Johnson, 59, was briefly interrupted as a protester was ordered from the inquiry room after refusing to sit down during the apology.
"Inevitably we got some things wrong," Johnson continued, before adding "we did our level best" and that he took personal responsibility for decisions made.
The former premier had arrived around three hours early for the proceedings, with some suggesting he was eager to avoid relatives of the Covid bereaved who gathered outside later in the morning.
Nearly 130,000 people died with Covid in the UK by mid-July 2021, one of the worst official per capita tolls among Western nations.
Johnson will insist the decisions he took ultimately saved hundreds of thousands of lives, the Times newspaper reported, citing a lengthy written statement set to be published later Wednesday.
The Times said he would argue he had a "basic confidence that things would turn out alright" on the "fallacious logic" that previous health threats had not proven as catastrophic as feared.
But he is expected to say that overall, the government succeeded in its main goal of preventing the state-run health service from being overwhelmed by making the "right decisions at the right times".
He will also say that while the country's death count was high, it defied most of the gloomiest predictions and "ended the pandemic well down the global league table of excess mortality".
According to The Times, Johnson, who quit in part because of revelations about lockdown-breaking parties in Downing Street, has reviewed 6,000 pages of evidence and spent hours in talks with lawyers.
He can expect to be questioned on whether he thought the government was initially complacent about the pandemic, despite evidence suggesting a more proactive approach was needed.
He will also need to justify his timing of the first UK lockdown on March 23, 2020, which some senior ministers, officials and scientific advisers now believe was too late.
Johnson, who was treated in hospital intensive care for Covid early on in the pandemic, is expected to say that shutting down the country went against all his personal and political instincts.
But he had no choice because "ancient and hallowed freedoms were in conflict with the health of the community".
Mr Johnson's understanding of specialist advice is likely to come under scrutiny after his former chief scientific officer, Patrick Vallance, said the former premier was frequently "bamboozled" by data.
Comments about lockdowns and the death count, including a claim that Johnson suggested the elderly might be allowed to die because they had "had a good innings", could also be raised.
Johnson has denied claims he said he would rather "let the bodies pile high" than impose another lockdown.
Johnson's former top aide Dominic Cummings and communications chief Lee Cain both criticised their ex-boss when they gave evidence at the inquiry.
Cummings said a "low point" was when Johnson circulated a video to his scientific advisers of "a guy blowing a special hairdryer up his nose 'to kill Covid'."
Cain said Covid was the "wrong crisis" for Johnson's skill set, adding that he became "exhausted" by his alleged indecision and oscillation in dealing with the crisis.
"He's somebody who would often delay making decisions, would often seek counsel from multiple sources and change his mind on issues," Cain said.
Prime Minister Rishi Sunak, who was Johnson's finance minister during the pandemic, is due to be questioned at the inquiry in the coming weeks.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)