John Gray is a philosopher. His academic career included professorships at Oxford University and the London School of Economics, and visiting professorships at Harvard and Yale in the USA. He retired from academia in 2008, and has dedicated himself to writing full time since then. He is the lead book reviewer of the New Statesman and a regular contributor to the Guardian.

Born in 1948 in South Shields, his father was a Tyneside dock worker, his mother a homemaker. A voracious reader as a child, and encouraged by his history teacher at his grammar school, he won a scholarship to read Philosophy, Politics and Economics at Oxford. Initially of the political Left, he became an advocate of the policies of the Right before the advent of Thatcherism. He then moved again to the Left. He supported the Leave cause in the Brexit referendum.

John contends that history is not progressive, but cyclical, and that any improvements other than certain scientific discoveries can be easily lost or reversed. He cites the use of torture against terror suspects as an example.

John has written several influential books, including False Dawn: The Delusions of Global Capitalism (1998), which predicted the global financial crisis; Straw Dogs: Thoughts on Humans and Other Animals (2002), which attacked philosophical humanism; and Black Mass: Apocalyptic Religion and the Death of Utopia (2007), a critique of Utopian thinking in the modern world.

Presenter: Kirsty Young

Matt Smith is best known as the eleventh Timelord in the BBC One series, Doctor Who. At 26, he became the youngest actor to take the part.

His future looked set to be in football: he played at youth level for Northampton Town, Nottingham Forest and Leicester City until a serious back condition ended his highly promising career prematurely. His drama teacher encouraged him to take up acting and he joined the National Youth Theatre and studied drama at the University of East Anglia. He played Lockwood in the National Theatre's touring production of The History Boys and was nominated for an Evening Standard Best Newcomer Award for his performance in Polly Stenham's That Face. He also appeared as a political researcher in the BBC Two parliamentary drama, Party Animals.

Despite being a surprise choice to play The Doctor in 2009, he became the first actor to be nominated for a BAFTA television award for his performance in this role, and has won two National Television Awards. When he left Doctor Who at the end of 2013, he appeared on stage as Patrick Bateman in American Psycho: The Musical.

In 2016 he took the part of HRH Prince Philip Mountbatten, The Duke of Edinburgh, in the Netflix series The Crown, and received great acclaim, leaving the role at the end of the second series in late 2017.

Presenter: Kirsty Young

Dame Minouche Shafik is the director of the London School of Economics and a former Deputy Governor of the Bank of England.

Producer: Sarah Taylor.

Christopher Nolan is best known for reviving the Batman film franchise and for directing the blockbusters Inception and Dunkirk. His films have taken nearly $5 billion at the box office. Born in London in 1970 to an English father and an American mother, he discovered film-making at the age of seven. In what he describes as "a leap of faith", his father lent him his Super 8 camera - and he's not stopped making films since. From youthful experiments, manipulating his action figures and shooting stop motion animations, he progressed to making short films at university where he read English - although he spent more time at University College London's Bloomsbury Theatre, home to the film society, than the lecture theatre.

His first feature film, Following, had enough festival exposure and critical success to secure him his first official budget of $4.5 million to make his next film, Memento. In 2005 he was hailed for reinventing the Caped Crusader in the dark and gritty Batman Begins. He regularly works with the same actors and production team including his long-time producer, his wife, Emma Thomas. The couple's latest film, Dunkirk, is nominated in the best picture category of the Oscars this year and Christopher has a nomination for Best Director.

Presenter: Kirsty Young

Chi-chi Nwanoku is a double bass player and founder of Europe's first professional majority black and minority ethnic orchestra, Chineke!.

Chi-chi is the eldest of five children, born to a Nigerian father and an Irish mother. Early on, she discovered two competing passions: playing the piano and 100 metre sprinting. She was aiming to qualify for the 1976 Olympics when she suffered a knee injury which cut short her life as an athlete. Her music teacher then suggested that she could have a career as a musician if she took up 'an unpopular orchestral instrument'. She began learning the double bass a week later.

She was a student at the Royal Academy of Music and for over 30 years has played with renowned orchestras, including the Academy of St Martin in the Fields, English Baroque Soloists, London Classical Players and the Orchestra of the Age of Enlightenment , which she co-founded and where she was principal double bass for three decades.

In 2015, she set up Chineke! to support, inspire and encourage black and minority ethnic musicians. Last year the Chineke! orchestra made its debut at the BBC Proms, and Chi-chi was awarded an OBE for her services to music.

Jack Whitehall, stand-up comedian, actor, sit-com writer and producer is Kirsty Young's castaway.

He co-wrote and starred in the sitcoms Fresh Meat and Bad Education. He and his father launched their chat-show Backchat in 2013 and recently made a TV series together travelling around Cambodia, Vietnam and Thailand. Jack played Paul Pennyfeather in a TV adaptation of Evelyn Waugh's Decline and Fall in 2016 and has forthcoming roles in Good Omens and a film about Marc Bolan and David Bowie.

The son of the talent agent and television producer Michael Whitehall and the actress Hilary Gish, he grew up in Putney. Sent away to boarding school at 11, he performed his first comedy gig aged 16 while still a pupil. He briefly attended Manchester University before he decided to exchange lectures for laughs and make his way in stand-up: he won the King of Comedy award at the British Comedy Awards in 2012, 2013 and 2014.

Presenter: Kirsty Young

Garry Kasparov is a Russian chess grandmaster, who became the youngest ever world champion at the age of 22. He is also a writer and a political activist.

He grew up in the Soviet Union, the only child of engineer parents. He learned chess by watching his parents play as they worked out chess problems in the newspaper. As a five year old he was fascinated by the mysterious little pieces and the board with its 64 squares.

Garry Kasparov's father died when he was seven and it was his mother who guided him on his chess career. As a player, he was nicknamed the Beast of Baku, because of his dynamic style at the chessboard. He became a grandmaster on his 17th birthday and went on to become the World Champion after beating Anatoly Karpov in a now-legendary series of games in the mid-1980s.

He played high-profile matches against the IBM computer Deep Blue in 1996 and 1997. Since his retirement from competitive chess, he has written numerous books and become a high-profile political activist.

Presenter: Kirsty Young

Christina Lamb is chief foreign correspondent for the Sunday Times and travels the world reporting from war zones and hot spots, speaking not just to key protagonists but also seeking out and detailing the daily impact of conflict on civilians.

An only child, and brought up in Carshalton Beeches, she was a voracious reader and dreamed of being an explorer. Although she was rebellious at school, and at one point was asked to leave, she won a place at Oxford and went on to edit the university newspaper. While working as an intern for the Financial Times, she interviewed Benazir Bhutto and was invited to her wedding in Pakistan. That experience led to her determination to be a reporter from the front line.

Her work has taken her to South Africa, Brazil, Zimbabwe, Afghanistan, Syria and Iraq, and among her best-selling books are two which tell the stories of remarkable young women - Nujeen Mustafa who escaped from Aleppo in her wheelchair, and the Nobel prize-winner Malala Yousafzai.

Presenter: Kirsty Young

Angela Hartnett is a chef, TV presenter and cookery writer. She holds a Michelin star and runs her own restaurants.

Angela was born in 1968 to an Italian mother and Irish father, and her culinary career has been influenced by her Italian background and her grandmother's cooking. After studying for a history degree, Angela began work in the catering industry before joining Gordon Ramsay at his restaurant Aubergine. In 2002 she took over at the Connaught, London, as the first woman chef to run its restaurant. When it closed five years later, she moved on to open her own restaurant, Murano, in 2008. She achieved a Michelin star in both establishments and has expanded her restaurant business.

She has been a regular contributor on some of TV and radio's most popular cookery programmes. In 2007, she was awarded an MBE for Services to the Hospitality Industry.

Producer: Cathy Drysdale

First broadcast on BBC Radio 4 in 2018.

Charlie Brooker is a satirist, broadcaster and writer. He created the Emmy-award winning series, Black Mirror, and presents Screenwipe and Newswipe which won Best Comedy Entertainment Show award at the British Comedy Awards in 2011.

Born in 1971, his career has been influenced both by his early love of technology - he was a keen computer gamer - and by his passion for the anarchic, surreal and experimental comedy of Monty Python and The Young Ones. After creating his own comic while at school, he went on to provide cartoons for the magazine Oink! at the age of 15. He cultivated his acerbic style and satirical pessimism as a writer of games reviews and features for PC Zone magazine.

His online creation TVGoHome, an often caustic parody of television listings in the style of Radio Times, brought him to the attention of the Guardian newspaper where he began writing a TV review column entitled Screen Burn in 2000. This was adapted into a BBC Four television series, and various spin-offs, including Gameswipe and Newswipe, followed.

The first two series of Black Mirror, an anthology of unrelated dramas focused around the unexpected consequences of new technologies, aired on Channel 4. The third series was released on Netflix in 2016, followed by a fourth at the end of 2017.

Charlie is married to former Blue Peter presenter Konnie Huq and they have two young sons.

Presenter: Kirsty Young