It comes as temperatures are set to reach 28C on Friday, while in the next 35 years, 40C summer heat is likely to become "typical".

Baroness Brown, of the Climate Change Committee (CCC), said cooling measures must be "rolled out at scale".

She was speaking to launch the CCC's major new report on how to defend the country against more intense flooding, heat and drought.

It identified more frequent heatwaves as the single greatest climate threat to public health, already driving excess deaths and sweltering maternity wards.

The experts called for maximum temperature regulations at work, cooling in hospitals and care homes by 2035 and in schools by 2050.

Baroness Brown also suggested ministers should consider shifting the school year, with studies showing children are more likely to fail exams as temperatures rise.

Chris Michael, co-founder of portable air conditioner manufacturer Meaco, said sales are already rising as summers "become hotter, and more consistently so".

He said our buildings were "not designed" for the high temperatures around the corner, adding: "This is one of the reasons why we are struggling."

A shift in the advice

Previously advisers cautioned against widespread use of air conditioning, as its use of energy and chemicals (known as HFCs) add to the global warming it is supposed to alleviate.

But with mega heat now baked in to the future for places like southern England and the Midlands, "actually air conditioning is going to be essential, particularly in places where we have vulnerable people like hospitals and care homes", said Baroness Brown.

"We think it's going to be unavoidable."

Sustainable cooling like shading, shutters and tree-cover should stay play a role, but in many cases would be too expensive or difficult to add on to existing buildings, the committee said.

It has already adjusted emissions budgets to take into account more air conditioning - while low-carbon heat pumps that will eventually replace many gas boilers can cool as well as heat homes.

Campaigners at the Environmental Investigations Agency warned air conditioning would add to the "urban heat island" effect that bakes cities, and said HFCs should be banned.

'Managed relocations' for some coastal communities

The CCC's wide-ranging report warned the "British way of life is under threat" from extreme weather, including flooding on sports pitches and dwindling water supplies on farms.

By 2050, 92% of homes are likely to overheat, peak river flows will be up to 45% higher and water shortfalls could reach five billion litres per day, it said.

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Meanwhile a small number of residents in flood-prone areas will eventually have to abandon their homes in "managed relocations", as defences fail to keep up with rising rivers and seas.

Parts of coastlines in Yorkshire, Norfolk and Suffolk are retreating by 2m to 4m per year.

The cost of adapting the country will run into billions of pounds for governments with little cash to spare. The CCC said the cost would be far less than the damage caused by doing nothing to protect against extreme weather.

The Green Alliance thinktank said "all political parties" should heed the report's warning about how poorly the UK is adapting to climate change so far.

"If they don't, voters will notice as the waters, temperatures and bills rise," it said.

More than 30 guns and a crossbow have been recovered from two properties as part of the investigation into an attack that left three men dead at the Islamic Centre of San Diego shortly before noon on Monday.

The teenagers suspected of carrying out the attack appear to have met and been radicalised online, and a "manifesto" about the shooting has been found, according to officials.

Mark Remily, of the FBI, told reporters that, according to writings by the suspects found by investigators, they shared a "broad hatred" toward different religions and races and engaged in "generalised hate rhetoric".

The alleged gunmen have not been officially named but have been ​identified as Caleb Vasquez, 18, and Cain Clark, 17, Reuters said, quoting Mr Remily, who revealed that Clark's mother is co-operating with authorities.

The suspects were found dead in a nearby vehicle, having taken their own lives.

Firearms used by one of the teenagers belonged to a parent, the FBI said.

Amin Abdullah, a mosque security guard who was one of those killed, shot at the attackers as they ran past him outside and also activated a security ⁠lockdown, San Diego Police Chief Scott Wahl said.

The suspects paused to return fire and fatally shot Mr Abdullah in the car park, Mr Wahl said.

By distracting the gunmen, the guard and the two other victims, mosque elder Mansour Kaziha, and neighbour Nadir Awad, gave others in the building time to take shelter behind locked doors, Mr Wahl said.

All three victims gave their lives to spare others from harm, he said, but singled out Mr Abdullah, saying his "heroic" actions "delayed, distracted and ultimately deterred those two individuals ‌from gaining access to the greater areas of the mosque where as many as 140 kids were within 15 feet (4.5m) of these suspects".

There was no specific threat against the centre, the city's largest mosque, which also houses the Bright Horizon Academy, but detectives are treating the attack as a hate crime.

'Courageous' guard remembered

The guard has been named by a family friend as Amin Abdullah, who had worked at the mosque for more than a decade.

Shaykh Uthman Ibn Farooq, who spoke with the victim's son, said: "He wanted to defend the innocent so he decided to become a security guard."

Mr Abdullah's family has not commented.

In a Facebook post, the mosque, which also houses a school, called him "a courageous man who put himself on the line for the safety of others, who even in his last moments did not stop protecting our community".

Those who died "were men who put themselves on the line for our masjid [mosque] and our community", the post said, adding they were "men of courage, sacrifice, and faith" whose absence "leaves a void that can never truly be filled".

It described one of the other victims as a "foundation of the centre" who was dedicated to building the community from the beginning, and the third man as someone whose "kindness, sincerity and wavering spirit touched everyone around him".

Mother reported son missing

Chief Wahl said police were already looking for the suspects at the time of the shooting after the mother of one of the teenagers reported that her son was suicidal and had run away, taking her vehicle and three guns, which missing from the family's home.

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Two hours later, the shooting started.

An appeal set up by the centre to support those affected by the tragedy had raised more than $557,000 (£416,000) of its $1m target by Tuesday afternoon, UK time.

US Vice President JD Vance, speaking at the White House, said that his wife, Usha, whose family lives in the city, told him she "would have known some people, or at least their parents" who used the centre.

He said "that type of violence in the United States of America is reprehensible".

Imam Taha Hassane, the mosque's director, called it "extremely outrageous to target a place of worship", while US President Donald Trump called the shooting a "terrible situation".

The Treasury has proposed relaxing some new packaging rules, and possibly delaying changes to rules around healthy food, in exchange for price caps, two sources told Reuters.

They said the supermarkets had reacted with anger, and are pushing back. The story was first reported by the Financial Times.

Sky News understands the government is not considering imposing supermarket price caps.

It comes as the government faces a cost of living crisis, and after the Scottish National Party proposed a price cap for "essential" foods.

"If this happened, nobody would invest in ⁠the UK," one of the sources told Reuters.

"If ⁠you want food price inflation to decline, you need to start looking at the cost of regulation on ‌business," they added, going on to highlight the government's moves to raise employer taxes, the national minimum wage, introduce new packaging levies and propose the reformulation of thousands of ‌food lines.

A spokesperson for the Treasury said: "The Chancellor [Rachel Reeves] has been clear we want to do more to help keep costs down for families, and will set out more detail in due course."

UK grocery inflation sat at 3.8% in the four weeks to 19 April, according to researcher Worldpanel by Numerator.

The Bank of England said businesses it had spoken to last month expected food price inflation to reach 6 or 7% later this year on the back of the economic fallout from the Iran war.

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The British Retail Consortium (BRC), which represents UK's major supermarket groups including Tesco and Sainsbury's, said it opposed price caps.

"Rather than introduce 1970s-style ⁠price controls, and trying to force retailers to ​sell goods at a loss, the government must focus on how it ​will reduce the public policy costs which are pushing up food prices in the first place," BRC CEO Helen Dickinson ‌said.

Officials have issued a licence, which comes into force on Wednesday, allowing the import of such oil products "indefinitely" - although it will be reviewed periodically by the business secretary.

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It comes amid fears of jet fuel shortages this summer as the conflict in the Middle East continues to restrict the global supply of oil.

The UK had banned the import of oil products refined in third countries from Russian-origin crude in October last year in a bid to ramp up financial pressure on Russia as it continued its war in Ukraine.

But it has reversed course through this latest move.

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Chancellor Rachel Reeves said at the time that banning the products was the "right approach to ensure that Russian oil is not finding its way onto global markets and indeed, finding its way into UK markets", and that ministers would "take whatever actions necessary to destroy the capability of the Russian government to continue this illegal war in Ukraine".

Other refined oil products made from Russian-origin crude oil, such as petrochemicals and heating oil, remain banned.

In January, the EU also banned products refined in other countries but made from Russian-origin oil.

Rollback elsewhere

A rowback has been taking place in the US as well.

On Monday, US Treasury Secretary Scott Bessent announced another extension of a sanctions waiver - allowing the purchase of Russian oil at sea.

As the major oil and gas shipping route, the closure of the Strait of Hormuz prevented fossil fuel flows, and oil prices rose, putting pressure on the Trump administration.

In an attempt to lower prices, the US government in March implemented a 30-day waiver on Indian refiners, allowing them to buy Russian oil at sea.

Russia has also been a beneficiary of higher oil prices, as its fossil fuel has become more valuable.

It comes after two women alleged they had been raped and another made claims of sexual misconduct.

A spokesperson for the Met Police said: "We are aware of media reporting relating to allegations of rape and sexual assault following the airing of a television programme on Monday, 18 May.

"At this time, we have not received any criminal reports in relation to this matter. We will be making approaches to the relevant production teams to ensure that anyone they have spoken to is aware of how to report any criminal allegations to police.

"We continue to encourage anyone who believes they have been a victim of sexual assault, no matter how long ago it happened, to get in touch with us."

The BBC had reported allegations from two women alleging they had been raped during filming of the Channel 4 show. A third described an allegation of a non-consensual sex act.

All three said the show, made by production company CPL, did not do enough to protect them.

Earlier on Tuesday, the government said there must be "consequences for criminality or wrongdoing" following the MAFS allegations.

Shona Manderson, the third of the three women making allegations about their experiences on the show and the only one who is named, said she "completely lost her light" while appearing in the series.

In claims made to BBC Panorama, she said she deserved better welfare from CPL.

She alleged her on-screen partner, Bradley Skelly, took things too far during sex. In a statement to the programme, Skelly said he categorically denied "any allegations of sexual misconduct, or that he was controlling".

Channel 4 has removed all previous seasons of the show from its streaming platforms.

In a statement released on Monday, Channel 4 said: "In April, Channel 4 was presented with serious allegations of wrongdoing against a small number of past contributors, allegations that we understand those contributors have denied.

"The channel is mindful of the privacy and continuing duty of care towards all contributors, and cannot comment on or disclose details of those allegations.

"Related to those allegations, Channel 4 was asked to respond to claims of failures in welfare protocols. Channel 4 believes that when concerns related to contributor welfare were raised through existing welfare and production protocols, prompt and appropriate action was taken, based on the information available at the time.

"Channel 4 strongly refutes any claim to the contrary."

Dr Charlotte Proudman, a barrister representing one of the women, named Lizzie, not her real name to protect her identity, said she was aware of other contestants from TV shows having experienced abuse.

She told Sky News' The UK Tonight with Sarah-Jane Mee: "I am certainly aware of other contestants on what I might describe as reality TV dating shows having experienced forms of hideous abuse behind closed doors, and effectively that being allowed to continue without action being taken to protect them.

"So I suspect that we will see many more women come forward, and I am obviously deeply concerned about the fact that Channel 4 continued to air Married at First Sight until yesterday after the BBC Panorama documentary."

It is understood that no decision has been made on future series of MAFS.