The reaction prompted Sir Brian Langstaff, chair of the inquiry, to remind people watching Mr Sunak that there is a tradition of “respecting the witness”.
Thousands of people died in what is widely recognised as the worst treatment disaster in the history of the NHS after being given contaminated blood products in the 1970s and 1980s.
Campaigners want to see all those infected and affected paid compensation, as recommended by the inquiry chair, but the government has said it will wait for a full report into the scandal before deciding on the matter.
However, he declined to give a timeframe for when the scheme might be widened to those whose children or parents died.
Asked by inquiry counsel Jenni Richards KC if he understands if justice delayed is justice denied, Mr Sunak said victims have been “let down for decades by successive governments”.
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But the audience groaned and one person said “you don’t listen” when he appeared to distance himself over delays during his time in cabinet.
Mr Sunak faced questions over correspondence about preparing for the “inevitable” compensation scheme sent to him by Penny Mordaunt, then paymaster general, when he was chancellor in 2020.
Image: Rishi Sunak gives evidence at infected blood inquiry
The prime minister said officials dealt with the inquiries.
Ms Richards asked: “Over three years and still no concrete compensation framework insights and no information about what it might look like. Is that good enough?”
The audience groaned as Mr Sunak answered: “Now, having not been at the time responsible for initiating this inquiry in 2018, 2017 when it was announced and determining its terms of reference, it’s hard for me to second guess the process that was envisaged at the time or what I would have done differently.”
There was also a round of laughter after he said “extensive” work across government had been undertaken so it can act as quickly as possible, adding “that work continues at pace”.
More laughter and groans came when the prime minister failed to say if the government has actions ready to go upon the conclusion of the inquiry after being asked several times.
Campaigners: ‘Our hearts are heavy’
The Infected Blood Inquiry was established in 2017 to examine how thousands of patients in the UK developed HIV and hepatitis C through contaminated blood products.
About 2,900 people have since died.
Many had the blood-clotting disorder haemophilia and were given injections of the US product Factor VIII.
Sir Brian has said an interim compensation scheme should be widened so more people – including orphaned children and parents who lost children – can be compensated.
He said in April he was taking the unusual step of making the recommendation ahead of the publication of the full report into the scandal so that victims would not face any more delays.
Following the PM’s evidence session, campaign group Factor 8 said: “Regrettably, the prime minister offered neither new information nor commitments to the victims and bereaved families of the Infected Blood Scandal.
“Despite our impassioned plea in the letter delivered to him on Monday, urging swift action in line with the inquiry’s recommendations, he did not take this golden opportunity to advance the cause of justice for victims and their families. Our hearts are heavy.”
Sir Keir Starmer is under mounting pressure to raise Israel’s bombardment of Gaza with Donald Trump during his UK state visit, after a UN Commission said a genocide was taking place.
Sir Ed, who is boycotting the state dinner being held for Mr Trump, said Sir Keir must “press” the president now.
He said: “What is happening in Gaza is a genocide. And the president of the United States, who wants a Nobel Peace Prize, is doing nothing to stop it.”
Image: Displaced Palestinians flee northern Gaza. Pic: AP
Israel‘s foreign ministry said it “categorically rejects this distorted and false report” and called for the commission to be abolished.
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3:05
Is Israel committing genocide?
‘We cannot be bystanders’
Reports suggest the situation will be a talking point between Sir Keir and Mr Trump during his visit.
It comes before the UK is due to recognise a Palestinian state at the UN General Assembly later this month, along with allies including Canada and France.
In a late night statement, Canada’s foreign ministry described the Gaza City offensive as “horrific”.
Lib Dem leader Sir Ed added: “We have long said that Hamas is genocidal and condemned them for their actions.
“Now, I think we have to say that what the Netanyahu government is doing amounts to genocide.”
Labour MP Rosena Allin-Khan, a former shadow minister, also called on her party leader to make discussing the situation in Gaza with Mr Trump a “top priority”.
Speaking to Sky News’ Politics Hub With Sophy Ridge, she said: “We say ‘never again’ when we look at Bosnia and Rwanda, but here we are again, and it’s been livestreamed, and we’ve all seen it.
“We cannot be bystanders to a genocide.”
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8:51
‘We cannot be bystanders’
UN report pulls no punches
The accusation of genocide is made by the UN Independent International Commission of Inquiry on the Occupied Palestinian Territory.
It alleges Israel has been “killing Palestinians or forcing them to live in inhumane conditions that led to death; causing serious bodily or mental harm, including through torture, displacement and sexual crime; deliberately imposing inhumane conditions, and fourthly, imposing measures intending to prevent births”.
Earlier this month, the International Association of Genocide Scholars also passed a resolution stating that Israel’s conduct passed the threshold of committing genocide.
However, a report from the British government said it had “not concluded” that Israel intended to “destroy in whole or in part a national, ethnic, racial or religious group”.
Nearly 65,000 people are now believed to have died, according to figures collated by Gaza’s Hamas-run health ministry. It does not distinguish between civilians and combatants in its count.
Downing Street has insisted its migrant returns scheme with France is not a “shambles” after the High Court blocked a man’s deportation.
Having seen the previous Conservative government’s Rwanda scheme run into trouble with the courts, the Labour administration’s alternative suffered its own setback on Tuesday.
An Eritrean man, who cannot be named for legal reasons, was due to be on a flight to France this morning.
He brought a legal claim against the Home Office, with lawyers acting on his behalf saying the case “concerns a trafficking claim”.
They also said he had a gunshot wound to his leg, and would be left destitute if he was deported.
The Home Office said it was reasonable to expect him to have claimed asylum in France before he reached the UK in August, but the ruling went in his favour.
Mr Justice Sheldon granted the man a “brief period of interim relief”.
While the judge said there did not appear to be a “real risk” he would face destitution in France, the trafficking claim required further interrogation.
He said the case should return to court “as soon as is reasonably practical in light of the further representations the claimant […] will make on his trafficking decision”.
A Number 10 spokesperson downplayed the development, insisting removals under the deal with France will start “imminently” and ministers are not powerless in the face of the courts.
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1:08
‘One in, one out’ deal: What do we know?
‘We told you so’
The pilot scheme was announced to much fanfare in July, after Emmanuel Macron made a state visit to the UK.
He wants the number of migrants being returned to France to gradually increase over the course of the scheme, to deter them from coming in small boats.
The pilot came into force last month and is in place until June 2026.
Tory leader Kemi Badenoch was quick to say “we told you so” following Tuesday’s court decision, while Reform UK’s Nigel Farage criticised the government’s plan.
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2:18
Migrant deal with France has ‘started’
The small boats crisis represents one of the biggest challenges for the new home secretary, Shabana Mahmood, following her promotion in Sir Keir’s recent reshuffle.
Describing the former justice secretary as “very tough”, he said: “She’s completely for real. I’ve known her for over 10 years – she really wants to see law and order restored.”
The UK has discussed adopting a more crypto-friendly approach with the US in a bid to boost industry innovation and attract more investment to Britain.