US President Donald Trump has imposed a 10% tariff on goods from most countries being imported into the US, with even higher rates for what he calls the "worst offenders".

But how exactly were these tariffs - essentially taxes on imports - worked out? BBC Verify has been looking at the calculations behind the numbers.

What were the calculations?

When Trump presented a giant cardboard chart detailing the tariffs in the White House Rose Garden it was initially assumed that the charges were based on a combination of existing tariffs and other trade barriers (like regulations).

But later, the White House published what might look like a complicated mathematical formula.

But the actual exercise boiled down to simple maths: take the trade deficit for the US in goods with a particular country, divide that by the total goods imports from that country and then divide that number by two.

A trade deficit occurs when a country buys (imports) more physical products from other countries than it sells (exports) to them.

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For example, the US buys more goods from China than it sells to them - there is a goods deficit of $295bn. The total amount of goods it buys from China is $440bn.

Dividing 295 by 440 gets you to 67% and you divide that by two and round up. Therefore the tariff imposed on China is 34%.

Similarly, when it applied to the EU, the White House's formula resulted in a 20% tariff.

Are the Trump tariffs 'reciprocal'?

Many commentators have pointed out that these tariffs are not reciprocal.

Reciprocal would mean they were based on what countries already charge the US in the form of existing tariffs, plus non-tariff barriers (things like regulations that drive up costs).

But the White House's official methodology document makes clear that they have not calculated this for all the countries on which they have imposed tariffs.

Instead the tariff rate was calculated on the basis that it would eliminate the US's goods trade deficit with each country.

Trump has broken away from the formula in imposing tariffs on countries that buy more goods from the US than they sell to it.

For example the US does not currently run goods trade deficit with the UK. Yet the UK has been hit with a 10% tariff.

In total, more than 100 countries are covered by the new tariff regime.

'Lots of broader impacts'

Trump believes the US is getting a bad deal in global trade. In his view, other countries flood US markets with cheap goods - which hurts US companies and costs jobs. At the same time, these countries are putting up barriers that make US products less competitive abroad.

So by using tariffs to eliminate trade deficits, Trump hopes to revive US manufacturing and protect jobs.

But will this new tariff regime achieve the desired outcome?

BBC Verify has spoken to a number of economists. The overwhelming view is that while the tariffs might reduce the goods deficit between the US and individual countries, they will not reduce the overall deficit between the US and rest of the world.

"Yes, it will reduce bilateral trade deficits between the US and these countries. But there will obviously be lots of broader impacts that are not captured in the calculation", says Professor Jonathan Portes of King's College, London.

That's because the US' existing overall deficit is not driven solely by trade barriers, but by how the US economy works.

For one, Americans spend and invest more than they earn and that gap means the US buys more from the world than it sells. So as long as that continues, the US may continue to keep running a deficit despite increasing tariffs with it global trading partners.

Some trade deficits can also exist for a number of legitimate reasons - not just down to tariffs. For example, buying food that is easier or cheaper to produce in other countries' climates.

Thomas Sampson of the London School of Economics said: "The formula is reverse engineered to rationalise charging tariffs on countries with which the US has a trade deficit. There is no economic rationale for doing this and it will cost the global economy dearly."

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Hungary's government has announced it is withdrawing from the International Criminal Court (ICC).

The move was announced by a senior official in Prime Minister Viktor Orban's government hours after Israel's leader Benjamin Netanyahu, who is sought under an ICC arrest warrant, arrived in Hungary for a state visit.

Orban had invited Netanyahu as soon as the warrant was issued last November, saying the ruling would have "no effect" in his country.

In November, ICC judges said there were "reasonable grounds" that Netanyahu bore "criminal responsibility" for alleged war crimes and crimes against humanity during the war between Israel and Hamas. Netanyahu has condemned the ICC's decision as "antisemitic".

The ICC, a global court, has the authority to prosecute those accused of genocide, crimes against humanity and war crimes.

Hungary is a founding member of the ICC, which counts 125 member states, and will be the first European Union nation to pull out of it.

The US, Russia, China and North Korea are among the nations that are not part of the ICC, and therefore do not recognise its jurisdiction.

Israel is also not part of the treaty, but the ICC ruled in 2021 that it did have jurisdiction over the occupied West Bank, East Jerusalem and Gaza, because the UN's Secretary General had accepted that Palestinians were a member.

Hungary now needs to send written notification to the UN Secretary General to leave the treaty, with the withdrawal taking effect one year later, according to article 127 of the Rome Statute.

Since the warrant was issued, Hungarian authorities should technically arrest Netanyahu and hand him over to the court in the Hague, although member states do not always choose to enforce ICC warrants.

In Europe, some ICC member states said they would arrest the Israeli leader if he set foot in their country, while others, such as Germany, announced that he would not be detained if he visited.

The White House had said the US rejected the ICC decision and Netanyahu has visited the country since the warrant was issued in November. His visit to Hungary marks Netanyahu's first trip to Europe since then.

Hungarian Defence Minister Kristof Szalay-Bobrovniczky, greeted Netanyahu on the tarmac of Budapest airport on Wednesday night, welcoming him to the country.

Soldiers lined a red carpet laid out for the Israeli leader as he exited his plane. After military honours at the presidential palace, he will meet Orban on Thursday.

Israel is appealing against the arrest warrants for Netanyahu and former defence minister Yoav Gallant, and strongly rejects the accusations. It both denies the authority of the ICC and the legitimacy of the warrants.

In the same ruling, ICC judges also issued a warrant against Hamas military commander Mohammed Deif, whom Israel says is dead.

The visit comes as Israel announced it was expanding its Gaza offensive and establishing a new military corridor to put pressure on Hamas, as deadly Israeli strikes were reported across the Palestinian territory.

The war in Gaza was triggered by the deadly Hamas-led attacks on southern Israel on 7 October 2023, which killed some 1,200 people and led to 251 hostages being taken to Gaza. Since then, more than 50,000 Palestinians have been killed, Palestinian health authorities say.

New trade tariffs unveiled by US President Donald Trump on Wednesday are expected to have a major global impact, and have been condemned by the European Union and other key US allies.

But Trump's latest import taxes may get a different response in China, whose leader could see them as a gift.

Here, BBC reporters in five major economies look at the nuances of how the announcements are being received where they are.

Europe could hurt US, but doesn't want to escalate

By Katya Adler, Europe editor in Brussels

European Commission chief Ursula von der Leyen spoke on behalf of all European Union (EU) countries when she said the new tax imports would cause "dire" consequences for millions of people around the globe.

She said there was "no clear path through the complexity and chaos" that the new tariffs would unleash worldwide.

But the Commission has promised to protect EU businesses, some of which will be more hard hit than others - like Germany's car industry, Italy's luxury goods and France's wine and champagne producers.

French President Emmanuel Macron has called an emergency meeting of French business leaders later on Thursday.

As the biggest single market in the world, the EU can hurt the US - targeting goods and services, including 'big tech' like Apple and Meta with counter-measures.

But it says its aim is not to up the ante here – it's to persuade Trump to negotiate.

On Wednesday night, Italian PM Georgia Meloni said that while she considered the tariffs wrong, everything would be done to try and reach an agreement with the US.

Tariffs a gift for Chinese leader

By Stephen McDonell, China correspondent in Beijing

A 54% tariff hit on Chinese goods entering the US is certainly huge and will no doubt hurt Chinese companies trying to sell into that market.

Beijing's countermeasures will also hurt US companies trying to reach the massive Chinese market.

But, in one way, these moves from Trump are also a gift to Chinese President Xi Jinping.

Xi is portraying his country as a champion of free trade, a backer of multilateral institutions, and making comparisons with the world's other superpower which is seen as trashing both of these.

Just last week, China's leader was sitting down with chief executives from big international corporations – including many from Europe – and the imagery was clear. The US under Donald Trump = chaos, trade destruction, national self-interest. China under Xi Jinping = stability, free trade, global cooperation.

The Chinese government has already mobilised its state media sector to attack this latest round of tariffs from the Trump Administration.

People may quibble with the Chinese Communist Party's reading of where the world sits, but every time Trump takes measures like these, it makes Xi's sales pitch easier to deliver.

And economic necessity may draw many countries closer to China and further from the US.

• Are Trump's Asia tariffs a 'full-frontal assault' on China?
• 'Not the act of a friend': Australia angry over tariffs

Some relief but no delight in UK

By Chris Mason, BBC political editor in London

Folks in government here had picked up a sense of the mood music – a sense that the UK was "in the good camp rather than the bad camp" as one figure put it to me – but they had no idea in advance what that would mean exactly.

But now we do know - a 10% tariff on the UK's exports to the US.

I detect a sense of relief among ministers, but make no mistake - they are not delighted. The tariffs imposed on the UK will have significant effects, and the tariffs on the UK's trading partners will have a profound impact on jobs, industries and global trading flows in the weeks, months and years to come.

It will be "hugely disruptive," as one government source put it.

There is an acute awareness in particular about the impact on the car industry.

Negotiations with the US over a trade deal continue. I am told a team of four UK negotiators are in "pretty intensive" conversation with their US counterparts – talking remotely, but willing to head to Washington if signing a deal appears imminent.

• Read more from Chris Mason: UK ministers stay up late for Trump announcements

India fears impacts - but some sectors have hope

By Nikhil Inamdar, India business correspondent in Delhi

Asian economies are among the hardest hit by Trump's new tariffs. Americans will have to pay a 46% tax on imported goods from Vietnam, and 49% for goods from Cambodia.

Relatively speaking, India has fared better.

But a 26% across-the-board tariff rate is still steep, and will severely affect major "labour-intensive exports", says Priyanka Kishore of the Asia Decoded consultancy.

"That will likely have a knock-on impact on domestic demand and headline gross domestic product(GDP)" at a time when growth is already stuttering, according to Kishore.

But India's electronics exports may potentially benefit as higher tariffs on rivals such as Vietnam could leads to the re-routing of trade.

That is unlikely to mitigate the overall negative growth impact of Trump's salvo though.

Unlike Canada, Mexico or the European Union, India has so far adopted a conciliatory approach to Trump and is negotiating a bilateral deal with the US. Whether this triggers a retaliation in Delhi, will be very closely watched.

The pharmaceutical industry - which accounts for India's largest industrial exports at some $13bn (£9.9bn) annually - will be breathing a sigh of relief, however, as medicines are exempt from these "reciprocal" tariffs.

• Can Trump' tariffs spark manufacturing boom in India?

South Africa hits out, as continent reels from aid cuts

By Wycliffe Muia in Nairobi

Trump's "reciprocal tariffs" are targeting dozens of African countries, including 30% for South Africa and 50% for Lesotho.

Many of these nations are already grappling with the effects of US foreign aid cuts, which provided health and humanitarian assistance to vulnerable countries.

South Africa - like some of the continent's other biggest economies including Nigeria and Kenya - has long had open trade agreements with the US, and the new tariffs could significantly affect existing economic ties.

It is included in the long list of countries dubbed the "worst offenders" that now face higher US rates - payback for unfair trade policies, Trump says.

"They have got some bad things going on in South Africa. You know, we are paying them billions of dollars, and we cut the funding because a lot of bad things are happening in South Africa," he said, before going on to name other countries.

In a statement, the South African presidency condemned the new tariffs as "punitive", saying they could "serve as a barrier to trade and shared prosperity".

• Read more from Wycliffe Muia: South Africa and Nigeria among countries hit by Trump's tariffs

• At a glance: The countries hit hardest by these plans
• UK: What this means for you and your money
• Explainer: What are tariffs, and why is Trump using them?
• Analysis: Trump's tariffs are his biggest gamble yet

It's 10am, and in a little over two hours, Wayne Hawkins will be dead.

The sun is shining on the bungalow where the 80-year-old lives in San Diego, California with his wife of more than five decades, Stella.

I knock on the door and meet his children - Emily, 48, and Ashley, 44 - who have spent the last two weeks at their father's side.

Wayne sits in a reclining chair where he spends most of his days. Terminally ill, he is too weak to leave the house.

He has invited BBC News to witness his death under California's assisted dying laws - because if MPs in London vote to legalise the practice in England and Wales, it will allow some terminally ill people here to die in a similar way.

Half an hour after arriving at Wayne's house, I watch him swallow three anti-nausea tablets, designed to minimise the risk of him vomiting the lethal medication he plans to take shortly.

Are you sure this day is your last, I ask him? "I'm all in," he replies. "I was determined and decided weeks ago - I've had no trepidation since then."

His family ask for one last photo, which I take. As usual, Stella and Wayne are holding hands.

Shortly after, Dr Donnie Moore arrives. He has got to know the family over the past few weeks, visiting them on several occasions alongside running his own end-of-life clinic. Under California law, he is what is known as the attending physician who must confirm, in addition to a second doctor, that Wayne is eligible for aid in dying.

Dr Moore's role is part physician, part counsellor in this situation, one he has been in for 150 assisted deaths before.

On a top shelf in Wayne's bedroom sits a brown glass bottle containing a fine white powder - a mixture of five drugs, sedatives and painkillers, delivered to the house the previous day. The dosage of drugs inside is hundreds of times higher than those used in regular healthcare and is "guaranteed" to be fatal, Dr Moore explains. Unlike California, the proposed law at Westminster would require a doctor to bring any such medication with them.

When Wayne signals he is ready, the doctor mixes the meds with cherry and pineapple juice to soften the bitter taste - and he hands this pink liquid to Wayne.

No one, not even the doctor, knows how long it will take him to die after taking the lethal drugs. Dr Moore explains to me that, in his experience, death usually occurs between 30 minutes and two hours of ingestion, but on one occasion it took 17 hours.

This is the story of how and why Wayne chose to die. And why others have decided not to follow the same course.

We first met the couple a few weeks earlier, when Wayne explained why he was going ahead with the decision to have an assisted death - a controversial measure in other parts of the world.

"Some days the pain is almost more than I can handle," he said. "I just don't see any merit to dying slow and painfully, hooked up with stuff - intubation, feeding tubes," he told me. "I want none of it."

Wayne said he had watched two relatives die "miserable", "heinous" deaths from heart failure.

"I hate hospitals, they are miserable. I will die in the street first."

Wayne met Stella in 1969; the couple married four years later. He told us it was something of an arranged marriage, as his mother kept inviting Stella for dinner until eventually the penny dropped that he should take her out.

They lived for many years in Arcata, northern California, surrounded by sweeping forests of redwood trees, where Wayne worked as a landscape architect, while Stella was a primary school teacher. They spent their holidays hiking and camping with their children.

Now Wayne is terminally ill with heart failure, which has already brought him close to death. He has myriad other health issues including prostate cancer, liver failure and sepsis which brings him serious spinal pain.

He has less than six months to live, qualifying him for an assisted death in California. His request to die has been approved by two doctors and the lethal medication is self-administered.

It was during our first meeting that he asked the BBC to return to observe his final day, saying he wanted terminally ill adults in the UK to have the same right to an assisted death as him.

"Britain is pretty good with freedoms and this is just another one," he said. "People should be able to choose the time of their death as long as they meet the rules like six months to live or less."

Stella, 78, supports his decision. "I've known him for over 50 years. He's a very independent man. He's always known what he wants to do and he's always fixed things. That's how he's operating now. If this is his choice, I definitely agree, and I've seen him really suffer with the illness he's got. I don't want that for him."

Wayne would also qualify under the proposed new assisted dying law in England and Wales. The measures return to the House of Commons later this month, when all MPs will have a chance to debate and vote on changes to the Terminally Ill Adults (End of Life) Bill.

The proposed legislation, tabled by Labour MP Kim Leadbeater, says that anyone who wants to end their life must have the mental capacity to make the choice, that they must be expected to die within six months, and must make two separate declarations - witnessed and signed - about their wish to die. They must satisfy two independent doctors that they are eligible.

MPs in Westminster voted in favour of assisted dying in principle last November but remain bitterly divided on the issue. If they ultimately decide to approve the bill, it could become law within the next year and come into practice within the next four years.

There are also divisions here in California, where assisted dying was introduced in 2016. Michelle and Mike Carter, both 72 and married for 43 years, are each being treated for cancer - Mike has prostate cancer that has spread to his lymph nodes, and Michelle's advanced terminal ovarian cancer has spread throughout much of her body.

"I held my mother's hand when she passed; I held my father's hand when he passed," Michelle told me. "I believe there's freedom of choice however for me, I choose palliative care… I have God and I have good medicine."

Michelle's physician, palliative care specialist Dr Vincent Nguyen, argued that assisted dying laws in the US state lead to "silent coercion" whereby vulnerable people think their only option is to die. "Instead of ending people's lives, let's put programmes together to care for people," he said. "Let them know that they're loved, they're wanted and they're worthy."

He said the law meant that doctors have gone from being seen as healers to killers, while the message from the healthcare system was that "you are better off dead, because you're expensive and your death is cheaper for us".

Some disability campaigners say assisted dying makes them feel unsafe. Ingrid Tischer, who has muscular dystrophy and chronic respiratory failure, told me: "The message that it sends to people with disabilities in California is that you deserve suicide assistance rather than suicide prevention when you voice a desire to end your life.

"What does that say about who we are as a culture?"

Critics often say that once assisted dying is legalised, over time the safeguards around such laws get eroded as part of a "slippery slope" towards more relaxed criteria. In California, there was initially a mandatory 15-day cooling off period between patients making a first and second request for aid in dying. That has been reduced to 48 hours because many patients were dying during the waiting period. It's thought the approval process envisaged in Westminster would take around a month.

'Goodbye,' Wayne tells his family

Outside Wayne's house on the morning of his death, a solitary bird begins its loud and elaborate song. "There's that mockingbird out there," Wayne tells Stella, as smiles flicker across their faces.

Wayne hates the bird because it keeps him awake at night, Stella jokes, hand in hand with him to one side of his chair. Emily and Ashley are next to Stella.

Dr Moore, seated on Wayne's other side, hands him the pink liquid which he swallows without hesitation. "Goodnight," he says to his family - a typical touch of humour from a man who told us he was determined to die on his terms. It's 11.47am.

After two minutes, Wayne says he is getting sleepy. Dr Moore asks him to imagine he is walking in a vast sea of flowers with a soft breeze on his skin, which seems appropriate for a patient who has spent much of his life among nature.

After three minutes Wayne enters a deep sleep from which he will never wake. On a few occasions he lifts his head to take a deep breath without opening his eyes, at one point beginning to snore softly.

Dr Moore tells the family this is "the deepest sleep imaginable" and reassures Emily there is no chance her dad will wake up and ask, "did it work?"

"Oh that would be just like him," Stella says with a laugh.

The family start to reminisce about hiking holidays and driving around in a large van they converted to become a camper. "Me and dad insulated it and put a bed in the back," says Ashley.

On the walls are photos of Emily and Ashley as small children next to huge carved Halloween pumpkins.

Dr Moore is still stroking Wayne's hand and occasionally checking his pulse. For a man who Emily says was "always walking, always outdoors, always active", these are the final moments of life's journey, spent surrounded by those who mean most to him.

At 12.22pm Dr Moore says, "I think he's passed… He's at peace now."

Outside, the mockingbird has fallen silent. "No more pain," says Stella, embracing her children in her arms.

I step outside to give the family some space, and reflect on what we have just seen and filmed.

I have been covering medical ethics for the BBC for more than 20 years. In 2006, I was present just outside an apartment in Zurich where Dr Anne Turner, a retired doctor, died with the help of the group Dignitas - but California was the first time I had been an eyewitness to an assisted death.

This isn't just a story about one man's death in California - it's about what could become a reality here in England and Wales for those who qualify for an assisted death and choose to die this way.

Whether you're for or against the proposed new Westminster law, the death of a loved one is a deeply personal and emotional time for a family. Each death leaves an imprint, as will Wayne's.

Additional reporting by Josh Falcon

Hungary's government has announced it is withdrawing from the International Criminal Court (ICC).

The move was announced by a senior official in Prime Minister Viktor Orban's government hours after Israel's leader Benjamin Netanyahu, who is sought under an ICC arrest warrant, arrived in Hungary for a state visit.

Orban had invited Netanyahu as soon as the warrant was issued last November, saying the ruling would have "no effect" in his country.

In November, ICC judges said there were "reasonable grounds" that Netanyahu bore "criminal responsibility" for alleged war crimes and crimes against humanity during the war between Israel and Hamas. Netanyahu has condemned the ICC's decision as "antisemitic".

The ICC, a global court, has the authority to prosecute those accused of genocide, crimes against humanity and war crimes.

Hungary is a founding member of the ICC, which counts 125 member states, and will be the first European Union nation to pull out of it.

The US, Russia, China and North Korea are among the nations that are not part of the ICC, and therefore do not recognise its jurisdiction.

Israel is also not part of the treaty, but the ICC ruled in 2021 that it did have jurisdiction over the occupied West Bank, East Jerusalem and Gaza, because the UN's Secretary General had accepted that Palestinians were a member.

Hungary now needs to send written notification to the UN Secretary General to leave the treaty, with the withdrawal taking effect one year later, according to article 127 of the Rome Statute.

Since the warrant was issued, Hungarian authorities should technically arrest Netanyahu and hand him over to the court in the Hague, although member states do not always choose to enforce ICC warrants.

In Europe, some ICC member states said they would arrest the Israeli leader if he set foot in their country, while others, such as Germany, announced that he would not be detained if he visited.

The White House had said the US rejected the ICC decision and Netanyahu has visited the country since the warrant was issued in November. His visit to Hungary marks Netanyahu's first trip to Europe since then.

Hungarian Defence Minister Kristof Szalay-Bobrovniczky, greeted Netanyahu on the tarmac of Budapest airport on Wednesday night, welcoming him to the country.

Soldiers lined a red carpet laid out for the Israeli leader as he exited his plane. After military honours at the presidential palace, he will meet Orban on Thursday.

Israel is appealing against the arrest warrants for Netanyahu and former defence minister Yoav Gallant, and strongly rejects the accusations. It both denies the authority of the ICC and the legitimacy of the warrants.

In the same ruling, ICC judges also issued a warrant against Hamas military commander Mohammed Deif, whom Israel says is dead.

The visit comes as Israel announced it was expanding its Gaza offensive and establishing a new military corridor to put pressure on Hamas, as deadly Israeli strikes were reported across the Palestinian territory.

The war in Gaza was triggered by the deadly Hamas-led attacks on southern Israel on 7 October 2023, which killed some 1,200 people and led to 251 hostages being taken to Gaza. Since then, more than 50,000 Palestinians have been killed, Palestinian health authorities say.

An oil tanker and cargo ship that crashed in the North Sea did not have "dedicated lookouts" in what were "patchy conditions", maritime investigators have found.

The Stena Immaculate, a US-registered tanker, was anchored 16 miles off the East Yorkshire coast when it was hit by the Portuguese-flagged Solong on 10 March.

The Marine Accident Investigation Branch has released an interim report into the incident, which resulted in fires and a rescue operation which saved 36 crew from both vessels.

One crewman, Mark Pernia, is missing and presumed dead. The Solong's Russian captain, Vladimir Motin, 59, has been charged with gross negligence manslaughter, and is due to stand trial in January 2026.

Listen to highlights from Hull and East Yorkshire on BBC Sounds, watch the latest episode of Look North or tell us about a story you think we should be covering here.

Tate Modern has announced it has received a major gift from a couple of art dealers in the form of a painting by the US modern artist Joan Mitchell.

It was unveiled on Thursday as one of a group of works being donated by the Miami-based philanthropists, Jorge M and Darleen Pérez.

The six-metre-long triptych, entitled Iva 1973, can now be viewed for free at the London gallery next to Mark Rothko's Seagram Murals.

Tate director Maria Balshaw said the gift was "one of the most important" it has received, describing the donation as "transformational".

'Accessible to all'

"To place such a significant and valuable work in public hands is an act of incredible generosity," said Balshaw.

"It is also an endorsement of Tate's ability to share our collection with the broadest possible audience," she added. "And to care for that collection for future generations."

Mitchell, who would've been 100 this year, was one of the most celebrated artists of the abstract expressionist movement.

Arts Minister, Sir Chris Bryant said the "spectacular donation" of Mitchell's "masterpiece", which was originally dedicated to her dog, shows "the amazing difference one person's generosity can make".

"I'm very grateful for this donation and for the work that went into making it possible," he said.

"We are committed to ensuring art is for everyone, everywhere and the generosity of the Pérez family ensures that great art remains accessible to all, whilst also enriching our national collection."

'Female artists play significant role'

Argentine-American businessman Mr Pérez is best known as the chairman and CEO of The Related Group, a Miami-based real estate company.

He has given or pledged over $100m (£76m) to Miami's public art museum, which was renamed the Pérez Art Museum Miami in his honour in 2013.

He also founded a not-for-profit contemporary art space in Miami called El Espacio 23.

Mr Perez told BBC News: "We've been talking to the Tate for a long time, we're great admirers of the Tate.

"Our hope is always that our art is seen by the highest number of people. The Tate has huge viewership, millions and millions of people coming in."

He added the work suited being displayed next to other famous artists. "This painting, when you see it next to the Rothko's, really resounds," he said, "and it'll be there forever.

"So when you talk about legacy, we like to think that our names will not be forgotten, and that they will live, not only with the British audience, but also with the international audience that comes to the Tate.

"We hope it fills a gap in the collection that is very important and maybe the most important art movement in America. It's found its home, we're very pleased with it here."

Mrs Pérez noted female artists "play a significant role in shaping the cultural landscape" and that is was therefore "pivotal that we support and celebrate their contributions."

"We've long admired Joan Mitchell's work and are thrilled to share Iva with the world through Tate Modern."

Their gift also includes a multimillion-dollar endowment to support Tate's curatorial research.

Also, a range of works and photographs by artists from across Africa and the African diaspora - including by Yinka Shonibare, El Anatsui and Malick Sidibé - will make their way from the Pérezes to Tate's collection over the coming years.

Additional reporting by Steven Wright.

Temperatures could reach 22C in parts of the UK on Friday, as mostly clear skies bring a bright, sunny start to April.

Parts of southern England have highs in the low 20s forecast for Friday afternoon. The Algarve, in Portugal, is set to see highs of 18C, accompanied by some showers.

Temperatures are expected to remain in the mid to high teens for England, Wales and parts of Scotland over the weekend and into Monday. Skies will be mostly clear, with some cloud expected for eastern Scotland and England on Saturday.

Meanwhile, the Met Office has issued an amber wildfires warning for parts of England, southern Scotland and Northern Ireland until Monday, as conditions are dry with strong winds.

Last month was the sunniest March since records began in 1910, according to the Met Office. It was also very dry, with the UK's rainfall total just 43% of the usual amount.

There is a good chance that the highest temperature recorded so far this year - 21.3C in Chertsey, Surrey and Northolt, London on 20 March - will be beaten.

London, Reading, Oxford and Cambridge are among places expected to experience the 22C warmth on Friday afternoon, while Cardiff and Carmarthen in Wales could see 21C around the same time.

Scotland and Northern Ireland are set to be relatively cooler, with highs of 11C for Edinburgh and 16C for Belfast.

While it is expected to be slightly cooler at the weekend - topping out at 19C in southern England - the public is being urged to avoid lighting fires outdoors, over concerns they could spread.

Scottish Fire and Rescue Service (SFRS) said on Wednesday that there was a "very high to extreme risk" of fires spreading.

This is because the warm, dry conditions are ideal for wildfires to start and spread.

There were 185.8 hours of sunshine in March, the Met Office says, while England recorded its sixth driest March and Wales its fourth driest since records began in 1836.

This means vegetation will be dryer than usual, making it easier to become fuel for a developing fire. Comparatively wet conditions in 2024 allowed more vegetation to grow.

At the same time, winds are anticipated to remain strong over the coming days, which are capable of spreading fires faster.

Wind gusts are expected to reach up to 34mph in England and southern Scotland on Friday and Saturday, and will be in the 20s across the UK into Sunday.

The National Fire Chiefs Council (NFCC) advises against using disposable barbecues in the countryside and parks, and discarding things like cigarettes and glass bottles that can cause a fire to start.

Parts of south-west England and Wales could see some rain on Friday morning, but this is expected to dissipate by mid-morning.

Saturday and Sunday are set to be mostly dry, before some rain reaches northern Scotland on Monday afternoon. Some parts of eastern England and Scotland could also see some low cloud and mist.

Into next week, high pressure will shift on top of the UK again, bringing lighter winds and more dry, sunny weather that will see temperatures warm up above the seasonal norm again.

Younger children should not be given any drinks containing artificial sweeteners, UK experts are now advising.

The Scientific Advisory Committee on Nutrition (SACN) recommendations apply to beverages such as sugar-free 'toothkind' squash that has ingredients such as aspartame, stevia, saccharin and sucralose.

It says preschool children should become accustomed to drinking water instead.

Sweeteners may help older children cut down on sugar though.

What are artificial sweeteners?

Eating too much sugar increases the risk of tooth decay and some long-term health conditions such as type 2 diabetes, obesity and cardiovascular disease.

Artificial sweeteners were developed as a substitute, providing a sweet taste with few or no calories.

All of the ones used in the UK are approved and have undergone rigorous safety tests.

But some are concerned that they enhance preferences for sweet tastes in children which can be hard to overcome.

After reviewing the available evidence, SACN says proof that sweeteners are cutting tooth decay is "poor", although a reduction in free sugars, alongside "other positive changes to diet", is likely to be beneficial to health overall.

It says there may be some value in using sweeteners to help reduce weight gain in the short to medium term, but "it is not essential and is not the only option."

And the SACN committee experts are concerned about "the gap in data" on UK population exposure to sweeteners.

They say there is currently "insufficient evidence" to carry out a full risk assessment and are asking goverment to gather more.

A Department of Health and Social Care spokesperson said government was committed to turning the tide on obesity, taking bold action to crack down on child-targeted junk food advertising on TV and online.

Prof Robin May, Chief Scientific Adviser at the Food Standards Agency, said: "We strongly support SACN's call for industry to make data on the quantity of these sweeteners in their ingredients publicly available to provide better information on how much people are consuming and to help inform our assessments of these ingredients."

Prof Graham Finlayson, Chair in Psychobiology, University of Leeds, said it was reasonable to be cautious, especially in children, but the evidence wasn't strong enough to dismiss non-sugar sweeteners as a tool for reducing sugar intake. 

"With obesity and diabetes rates rising, knee-jerk policy changes could do more harm than good," he warned.