Matthew Sweet and guests discuss the impact of the shifting geo political and economic trends on the British class system with specialist guests. Muriel Zagha is a writer and critic and Author of Finding Monsieur Right and co-host of the podcast Garlic and Pearls. Lisa Holdsworth is a Leeds based TV script writer who has worked on amongst others Emmerdale, Midsomer Murders, Robin Hood, New Tricks and Waterloo Road. Her latest series Dreamers premiers on Channel 4 this weekend. Professor Sam Friedman is a sociologist of class and inequality. His latest book with Aaron Reeves is Born To Rule exploring how the British elite has changed over the last 120 years. Lord Willetts is the President of the Resolution Foundation’s Advisory Council and of the Intergenerational Commission and Chair of the UK Space Agency. He is a visiting Professor at King’s College London and Chair of the Foundation for Science and Technology. Earlier this month he was appointed as Chair of the Regulatory Innovation Office. Professor Melinda Mills is a demographer based at Nuffield College, University of Oxford, who will talk about new research which suggests that socio-economic status ia social construct with heritable component and genetic consequences.

Producer: Lisa Jenkinson

As Radio 4 marks the 5th anniversary of the first COVID lockdown, Free Thinking investigates one of the defining experiences of that period for many people: isolation. It's a word that entered the English language in the 18th century, and arguably its emergence as a concept marked a change in the way people saw their relationships with other people and the wider community, towards a more individualistic society. And yet there's a long history of religious mystics seeking solitude. From Robinson Crusoe to the crew of the International Space Station, via monasticism and Romanticism, Matthew Sweet investigates the histories of isolation and solitude.

With: Mark Vernon, psychotherapist with a deep interest in the role of solitude in the Western spiritual tradition. His book Awake! William Blake and the Power of the Imagination will be published in June. Lucy Powell, Lecturer in English Literature at the University of Oxford Kathleen Burk, Professor Emerita of Modern and Contemporary History at University College London, who will talk about isolationism as an aspect of the American political psyche Jim Hoare, diplomat who opened the first British embassy in North Korea in the 1990s. Catherine Coldstream, writer and former Carmelite nun, her memoir is Cloistered: My Years As A Nun

Producer: Luke Mulhall

Matthew Sweet and his guests discuss our shifting relationship with evidence from the law, to science, academic study and the paranormal. He's joined by Uncanny TV presenter Danny Robins, the former Supreme Court judge Lord Sumption and author of The Challenges of Democracy and the Rule of Law, Dr Sarah Dillon from the faculty of English at the University of Cambridge. Dr Jonathan Egid philosopher at SOAS in London and Dr Anthony Milligan a philosopher at Kings College London.

Producer: Lisa Jenkinson

Anne McElvoy and guests discuss the issue of uncertainty from scientific discovery and the space race to the shifting geopolitical landscape and how it can act as a catalyst for creativity. She's joined by the entrepreneur and author of Embracing Uncertainty, Margaret Heffernan, journalist and economist Liam Halligan, Astrophysicist Chris Lintott who also presents The Sky at Night, historian Timothy Garton Ash and Professor Victoria Donovan and author of Life in Spite of Everything: Tales from the Ukrainian East.

Producer: Lisa Jenkinson

Free Thinking looks at today's world with "a pinch of salt" tonight. From stories in the bible to desalination plants, preserving food to salt taxes: how does salt help us think about the past and present? We use phrases like "being worth your salt" or "dropping salt" meaning to spread rumours. With food writer Bee Wilson, materials scientist Mark Miodownik, the novelist and writer on folklore Zoe Gilbert and artist David Soin Tappeser. Plus, especially salty guest Baga Chipz. Matthew Sweet hosts.

David Soin Tappeser, along with Himali Singh Soin, is one half of Hylozoic/Desires, whose exhibition Salt Cosmologies is at Somerset House in London until the 27th April.

Producer: Luke Mulhall

Matthew Sweet and guests discuss changing course in life, flexible thinking and keeping an open mind with writer and curator Ekow Eshun, philosopher Sophie Grace Chappell, journalist Stephen Bush, author Timandra Harkness & philosopher Richard Bett

Producer: Lisa Jenkinson

From classical thinking to the romcom films in cinema today: Why do we yearn to find our "other half" but struggle with the reality of long term relationships? To discuss Rana Mitter is joined by: Dr Susie Orbach: a psychotherapist and author of Fat is a Feminist Issue as well as many other books Classicist Prof Armand D'Angour: he has just published a book about Plato's thinking on love - How to Talk about Love: An Ancient Guide for Modern Lovers Dr Vittoria Fallanca: She has new research on the opposite figure to Eros - Anteros - the god of requited love, and the avenger of unrequited love, and his place in the history of philosophy Catherine Wheatley: She is Professor of Film and Visual Culture at Kings College London Mary Harrod: She is Professor of French and Screen Studies at the University of Warwick.

Producer: Lisa Jenkinson

Matthew Sweet with art critic TJ Clark, who has written about the importance of repeated viewing for appreciating a work of art; philosopher and film historian Lucy Bolton, who's seen a re-issue of Chantel Akerman's film Jeanne Dielman, which documents the crushing routine of a Belgian housewife; philosopher and theologian Clare Carlisle, who has written on the philosopher Kierkegaard, who discussed repetition as a major feature structuring human life, and historian and educationalist Anthony Seldon. Plus composer, dramatist and regular silent film accompanist Neil Brand will be at the piano.

TJ Clark's new collection of Essays is called Those Passions: On Art and Politics. The BFI is hosting a season of films by Chantal Akerman which runs for 2 months in London with further screenings at selected cinemas - and the 2k restoration of the film Jeanne Dielmann is in cinemas across the UK Anthony Seldon's books include Truss At 10: 49 Days That Changed Britain; Johnson at 10: The Inside Story and The Fourth Education Revolution Book by Anthony Seldon Clare Carlisle's book is called Philosopher of the Heart: The Restless Life of Soren Kierkegaard

Producer: Luke Mulhall

Matthew Sweet and guests talk about about the tools and processes of decision making today and through history. Justine Greening is a former Secretary of State for Education who is now working on social mobility and levelling up. Professor Bill Sherman heads the Warburg Institute, which has just opened an exhibition about tarot which the filmmaker and magik scholar K A Laity has visited. Gary Stevenson is a former financial trader and the author of The Trading Game, and the philosopher Constantine Sandis is the author of The Things We Do and Why We Do Them.

Producer: Lisa Jenkinson

“A diary is not only a text: it is a behaviour, a way of life, of which the text is a by-product", says the French theorist Philipe Lejeune. From ancient Babylon to journalling today, politicians' jottings and the notes made by eighteenth century writers like Mary Hamilton and Fanny Burney. Matthew Sweet discusses diaries with curator Irving Finkel, literary historian Sophie Coulombeau, political commentator Michael Crick and writer Oliver Burkeman, whose latest book is Meditation For Mortals, plus the philosopher Maximillian De Gaynesford. And, as Radio 4 marks the 100th anniversary of the birth of Russell Hoban with a reading of his novel Turtle Diary as Book At Bedtime, writer Sonia Overall discusses his work. Producer: Luke Mulhall

What tactics are justified in political campaigning from suffragettes to climate action? When is an art work finished? Do the moderation of Aristotle and Epicurus offer us a way of navigating life? Christmas - a time for panto, over-eating and gaudy decorations - was your festive season overwhelming or excessive? The writer and broadcaster Andrew Doyle, the classicist Edith Hall, comedian Rob Newman, environmentalist Rupert Read, and performer and suffrage historian Naomi Paxton join Shahidha Bari to discuss when enough is enough, knowing when to stop and how far should free speech go.

Producer: Lisa Jenkinson