She was sentenced to 14 whole-life orders and will never leave prison.
The prime minister was asked if the government inquiry into her crimes will be statutory, meaning people can be compelled to give evidence.
Ministers had previously said that “after careful consideration”, a non-statutory inquiry into the circumstances at the Countess of Chester Hospital “was found to be the most appropriate option”.
But lawyers for the bereaved families have been calling for a full statutory public inquiry to take place so there was “nowhere to hide”.
“This was one of the most despicable, horrific crimes in our history, and it’s really important that we get answers, particularly for the families of the victims,” Mr Sunak said.
“And of course, my thoughts are with them. The health secretary is taking that work forward, speaking to them to make sure we understand what they need and want and how best we can address that.
“Now, whatever form the inquiry takes, I believe it is important that it is judge-led so that it has a strong, independent voice to get to the bottom of what happened.”
Richard Scorer, from law firm Slater and Gordon which is representing two of the Letby victims’ families, welcomed the prime minister’s recommendation for a judge-led inquiry.
But he added: “It is crucial that the judge and the inquiry has the powers to compel witnesses to give evidence under oath, and to force disclosure of documents.
“For that to happen, the inquiry needs to be put on a statutory basis.
“Otherwise it will lack legal teeth and is likely to be ineffective.”
Tamlin Bolton of Switalskis Solicitors, who represent families of seven of the victims in their claims against the hospital trust, said: “We reiterate and echo the prime minister’s comments.
“We have to bear in mind that the families involved in these heinous crimes have lost confidence in the NHS and will need continual reassurance that the NHS fully comply with an inquiry.
“We are of the view that this can only be achieved by a process that is guaranteed to allow for thorough investigation. A process that has the ability to compel witness attendance and where all evidence is available to the inquiry.
“These families cannot be left to simply hope that the key information is being considered and rely on the willingness of staff to give evidence.
“It is vital that any inquiry moves with pace to ensure everything that happened on that unit and the actions of management are not repeated.”
Letby, 33, refused to attend court for the announcement of a number of guilty verdicts on Friday or for her sentencing on Monday.
Sky News understands the government is now looking at changing the law to force criminals to appear.
The UK is ready to spend “well over” £100m on a possible deployment of British forces to Ukraine if Donald Trump secures a peace deal with Russia, the defence secretary has said.
John Healey also said Vladimir Putin views Britain as his “number one enemy” because of the country’s support for Ukraine.
The defence secretary’s plan includes the preparation of military personnel to join a multinational force that would be sent to help secure Ukraine’s borders if the US president brokers a ceasefire between Moscow and Kyiv.
He signalled British troops could be ready to deploy as soon as that happened and he said this could include soldiers on the ground.
Some of the anticipated money to prepare for any mission is already being spent.
The defence secretary also warned of a “new era of threat” and said the risk of wider conflict in Europe has not been as great since the end of the Second World War.
Mr Healey used a lecture at Mansion House in London to talk about efforts led by the UK and France to build a “coalition of the willing” of more than 30 nations to form what he called a “Multinational Force Ukraine” over the past six months.
Image: At Mansion House this evening. Pic: PA
This force would help to secure Ukraine’s skies and seas and train its troops if Russia agrees to halt its full-scale war.
“So, as President Trump leads the push for peace here in Europe, we are ready to lead the work to secure it in the long-term,” the defence secretary said.
“For our Armed Forces, I am already reviewing readiness levels and accelerating millions of pounds of funding to prepare for any possible deployment into Ukraine.”
Asked how much money, he said it would be “well over” £100m.
Image: British troops have been instrumental in the training of Ukrainian soliders throughout the conflict at camps like this one in East Anglia.Pic: PA
Mr Healey trumpeted the UK’s support for Ukraine, including a record £4.5bn in assistance this year, and taking over from the United States in co-chairing a wider group of nations that have been sending weapons and money to Kyiv.
“This is why President [Volodymyr] Zelenskyy calls the UK his closest ally,” he said.
“This is why Putin ranks Britain as his number one enemy.”
But he warned that as Russia’s aggression grew in Ukraine and beyond its borders, “Britain and our NATO allies stand more unified, and stronger”.
Giving a stark verdict of the security landscape, Mr Healey said: “This is – undeniably – a new era of threat. The world is more unstable, more uncertain, more dangerous. Not since the end of the Second World War has Europe’s security been at such risk of state-on-state conflict.”
He said this required what he described as “a new era for defence”.
He said: “This is now an age for hard power, strong alliances and sure diplomacy.”
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The defence secretary said plans for the new era would include increasing defence spending to 5% of GDP by 2035 – though critics have accused the UK and other European allies of playing smoke and mirrors with the target, questioning how much will really be spent on weapons and troops.
“As I look ahead to the rest of this decade, our task, in this new age of hard power is to secure peace in our continent and to forge stronger deterrence and resilience, a New Deal for European security,” said Mr Healey.
Turning to the Middle East, he also announced the UK was sending a two-star military officer to work as the deputy to the US commander, charged with monitoring the ceasefire between Israel and Hamas.
The government will allow thousands of rapists, child sex offenders and other violent criminals to be released early from prison, the Conservatives claimed as a row over sentencing law reforms erupted.
Ahead of MPs debating the Sentencing Bill, introduced to tackle the growing prison population, on Tuesday, the Tories accused Labour of favouring criminals over victims and said the government’s approach is a “betrayal of victims”.
But Labour accused the Conservative Party of “rank hypocrisy” over prison overcrowding and the previous government’s early release policies.
The bill will restrict the use of short sentences and instead strengthen community punishments.
It will also include an “earned progression scheme”, which allows convicts who demonstrate good behaviour to be freed earlier, with enhanced supervision in the community followed by an unsupervised period on licence.
There will be a minimum release point of 33% for standard determinate sentences and a 50% minimum for more serious standard determinate sentences – as well as more tagging to monitor offenders in the community.
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The Tories claim the bill as it is would mean 85% (6,500) of the most serious jailed offenders could qualify for early release because they are serving standard sentences, while more than 83% of child sex offenders and 62% of convicted rapists would serve reduced sentences.
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They have tabled an amendment to the bill to ensure a carve out for the most serious crimes, so those who commit assault by penetration, rape, grievous bodily harm, stalking and sexual offences against children cannot be released early.
Under Labour plans to abolish custodial sentences below 12 months, the Tories calculated up to 43,000 offenders could avoid jail altogether.
They said the bill could lead to permanent leniency in sentencing.
Conservative shadow justice minister Dr Kieran Mullan said: “Labour’s early release plan is a betrayal of victims and a gift to rapists and paedophiles. Keir Starmer is putting criminals before communities and letting predators out early.
“Under Labour’s plans, thousands of the most serious and sickening offences imaginable would no longer be treated as such. What an insult to thousands of victims across the country.
“Anyone who vote for these plans will have to explain exactly why these crimes do not count among the most serious offences.
“The Conservatives will fight this moral rot every step of the way.”
Image: Justice Secretary David Lammy at Belmarsh prison. Pic: PA
But sentencing minister Jake Richards accused the Tories of “rank hypocrisy” as he said the previous government took prisons to “breaking point”.
He said Labour are “cleaning up the mess” left by the Tories and accused them of “feigned outrage”.
“The Conservatives’ rank hypocrisy is shameful. They built this crisis, then feigned outrage when the consequences arrived,” he added.
“They took our prisons to breaking point, released thousands of serious offenders early and pushed Britain to the brink of a situation where police could no longer make arrests and courts could no longer prosecute.
“That would have been a total collapse of law and order.
“Now they attack us for cleaning up the mess they made. They are behaving like arsonists complaining the fire service couldn’t stop the flame.
“This Labour government believes in prison and in punishment that cuts crime.
“We’re delivering the biggest prison expansion since the Victorians, reforming sentencing to keep the public safe and building a justice system worthy of the name.”
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