A record 25 female billionaires have made it onto this year's Sunday Times Rich List.
Swedish-born horse breeder Kirsten Rausing, a former director of the National Stud, has been named the UK's wealthiest woman with a fortune of £12.1bn.
The granddaughter of Ruben Hausing, founder of the Swiss packaging company Tetra Pak, she also owns half of the British Bloodstock Agency, which buys and sells racehorses on behalf of wealthy clients.
Her aunt Maris Rausing is worth £9.59bn and is the third richest woman on the list, which reveals the 1,000 wealthiest individuals in the UK.
Businesswoman Charlene de Carvalho-Heineken, who owns a 25% stake in beer giant Heineken, is Britain's second richest woman with an estimated £10.3bn.

Actresses Salma Hayek, whose husband François-Henri Pinault oversees luxury brand Gucci and Catherine Zeta-Jones, who has a combined wealth of £210m with husband Michael Douglas, are also among the 150 women named on the list.
It also includes Harry Potter author J K Rowling, now worth £795m, Yorkshire-born novelist Barbara Taylor Bradford and Fifty Shades writer E L James.
A new entry this year is Rihanna, who has a fortune £468m.
The Barbados-born singer, who now lives in north London, is 48th in the women's Rich List thanks to her Fenty Beauty comestics brand, valued at £3bn, lingerie line Savage X Fenty and the proceeds from her eight albums.
With £9.2bn former Miss UK Kirsty Bertarelli is the UK's fourth-richest woman, the wife of Ernesto Bertarelli, former owner of biotech giant Serono.
Denise Coates, joint chief executive of Bet365, comes in at number five with £7.166bn.

The gambling giant is valued at £6.5bn with its profits up by nearly a fifth in 2018-19 to £791.4m, despite the coronavirus pandemic leading to sporting fixtures being cancelled across the world.
The full 2020 Rich List is published on May 17 in a 136-page special edition of the Sunday Times Magazine, and online at thesundaytimes.co.uk/womensrichlist.
The list is based on identifiable wealth and assets such as land, property, art and racehorses, or significant shares in publicly quoted companies.
The richest women in the UK are:
Kirsten Rausing - Tetra Pak - £12.1bn
Charlene de Carvalho-Heineken - Heineken - £10.3bn
Marit Rausing and family - Tetra Pak - £9.59bn
Kirsty Bertarelli - biotech giant Serono -£9.2bn
Denise Coates - Bet365 - £7.166bn
Salma Hayek - Kering group which owns brands like Gucci -£6.592bn
Baroness Howard de Walden and family - property - £4.316bn
Leonie Schroder and family - Schroders asset management - £3.977bn
Carrie Perrodo and family - Perenco oil and gas company - £3.438bn
Harriet Heyman - internet - husband invested in Google - £3.047bn
Inna Gudavadze and family - inheritance - £2.65bn
Princess Marie-Chantal and family - duty-free shopping, fashion and finance - £2.15bn
Sarah Dawson - The Range - £2.05bn
Lady Charlotte Wellesley - brewing, investing and inheritance - £2.031bn
Kiran Mazumdar-Shaw - MD of pharmaceutical firm Biocon - £1.808bn
Varsha Engineer - pharmaceuticals firm Chemidex - £1.8bn
Dame Mary Perkins and family - Specsavers - £1.8bn
Emily von Opel - finance and property - £1.654bn
Anita Zabludowicz - property and hotels - £1.5bn
Lady Ballyedmond and family - veterinary pharmaceuticals - £1.345bn
Marit Mohn Westlake and family - oil pump business - £1.325bn
Elisabeth Murdoch - daughter of Rupert Murdoch - £1.2bn
Yelena Baturina - construction - £1.144bn
Lady Philomena Clark and family - car sales - £1.131bn
- Ursula Bechtolsheimer and family - inheritance - £1bn