The personal fortune of British Prime Minister Rishi Sunak and his wife Akshata Murty surged by more than £120m over the past year.
The latest annual Sunday Times Rich List revealed their wealth grew substantially despite the wider UK billionaire boom coming "to an end" in the face of tough economic conditions.
Mr Sunak and Ms Murty's wealth was £651m in the latest list, soaring from £529m in 2023.
The rise was linked to Ms Murty's small stake in Infosys, the $70 billion Indian IT giant co-founded by her billionaire father.
Her shares grew in value by £108.8m to nearly £590m for the year.
The couple's wealth however still remains below its level from 2022, when it sat at around £730m for the year.
It came as the list of the richest people in Great Britain showed that King Charles' wealth also grew for the year, rising to £610m from £600m.
Charles, who acceded to the throne less than two years ago, ranks 258th in the list of the UK's 350 wealthiest people and families, up from 263rd place in 2023.
Calculations by the newspaper's Rich List suggest the monarch has benefited from a boost to the net worth of his properties.
His inherited private estates Sandringham in Norfolk and Balmoral in Aberdeenshire, which belonged to his mother the late Queen, are said to account for much of his financial fortune.
Only personal assets - not the Crown Estate, the Duchy of Lancaster, nor the Crown Jewels which are held in trust by the King for the nation - are included by The Sunday Times when assessing the sovereign's wealth.
The list recorded that the number of British billionaires tumbled again, continuing a theme seen in 2023.
The number of billionaires reached a peak of 177 in 2022, before dropping to 171 and falling again to 165 this year, driven by some seeing their private wealth contract amid high borrowing rates and others leaving the country.
Robert Watts, compiler of the rich list, said: "This year's Sunday Times Rich List suggests Britain's billionaire boom has come to an end".
"Many of our home-grown entrepreneurs have seen their fortunes fall and some of the global super rich who came here are moving away. Thousands of British livelihoods rely on the super-rich to some extent," he said.
"We'll have to wait and see whether we have now reached peak billionaire, and what that means for our economy," he added.
The list of Britain's 350 wealthiest individuals and families together hold combined wealth of £795.36 billion, according to the new data.
This year's list was once again topped by Gopi Hinduja and his family, who control the Indian conglomerate Hinduja Group.
Mr Hinduja and his family saw their wealth rise to £37.2 billion for the year from £35 billion.
Meanwhile, a number of the UK's highest profile billionaires saw their fortunes shrink over the year amid challenging periods for many businesses and investments.
Jim Ratcliffe, James Dyson and Richard Branson also recorded declines for the year.
Manchester United investor and Ineos founder Jim Ratcliffe was the biggest faller on the list, with his net worth dropping by over £6 billion to £23.52 billion.
James Dyson was the second largest faller, with the entrepreneur witnessing a drop to £20.8 billion from £23 billion.
Meanwhile, Richard Branson saw his wealth fall further, dropping to £2.4 billion from £4.2 billion after a challenging year for Virgin Galactic.
The 2024 Sunday Times Rich List charts the wealth of the 350 richest people in the UK and the list is based on identifiable wealth, including land, property, other assets such as art and racehorses, or significant shares in publicly quoted companies.
It excludes bank accounts, to which the outlet has said it has no access.
Dua Lipa and Harry Styles named in Sunday Times under 40 Rich List
Harry Styles and Dua Lipa are among a number of celebrities who feature in the first edition of The Sunday Times 40 Under 40 Rich List.
At the age of 33, and in 10th place on the 40 Under 40 list, is Shape Of You singer Ed Sheeran, who has been crowned the richest young musician in the UK with £340m.
The next wealthiest UK pop star under the age of 40 is former One Direction member Styles, 30, who made his £175m through music and film appearances.
The Brit award-winner has also invested in Manchester-based music venue, Co-Op Live, which opened on May 14 following a number of setbacks.
The As It Was singer is placed joined 17th on the list alongside boxing star Anthony Joshua.
In the 19th spot is 16-time Grammy-winner Adele with £170m. The Tottenham-born singer began a residency at The Colosseum at Caesars Palace in Los Angeles in 2022, which will come to an end in November this year.
Joint 29th is actor Daniel Radcliffe and pop star Dua Lipa, 28, with a respective £90m.
Lipa, who will perform a headline slot at Glastonbury Festival in June, recently released her third studio album Radical Optimism which soared to the number one spot on the official UK albums chart.
Radcliffe, 34, made his millions when he shot to fame as a child star playing the title character in the Harry Potter film series, adapted from the novels created by JK Rowling.
Topping the list, which showcases British talent from music, sport, entertainment, and business, is Hugh Grosvenor, the seventh Duke of Westminster, with £10.1 billion.
The duke inherited his title and a vast land and property portfolio at the age of 25.
The majority of the people on the 40 Under 40 list made their millions on their own, but nine were born into money, according to The Sunday Times.
The top nine on the list also feature in the main Sunday Times Rich List, where the minimum figure for entry is £350m.
Robert Watts said that despite the tougher business environment, there are many impressive entrepreneurial stories in this year's Sunday Times Rich List.
"Our 40 under 40 list includes individuals who have quickly built fortunes from fashion, vodka, sport, and increasingly the tech sector and AI. "Many of these young guns are already employing hundreds of people and some will go on to be the future of the British economy," he added
The 40 Under 40 List includes individuals with the biggest fortunes aged 40 or under as of May 1 this year.
