From undercover field operatives to online anonymity, via lives led in the closet and large scale infidelity, Matthew Sweet discusses the what can prompt people to lead double lives.

Producer: Luke Mulhall

What does the phrase 'Victorian values' conjure today? Matthew Sweet and guests explore what we have inherited from that formative era in relation to political ideas, civic culture, aesthetics, and social and sexual mores. How does our view of the Victorian age match the historical reality? And can we move beyond stereotypes of repression and the stiff upper lip?

AN Wilson, writer, biographer and historian

Gisela Stuart, Baroness Stuart of Edgbaston, crossbench peer in the House of Lords

Sarah Williams, Research Professor in the History of Christianity at Regent College in Vancouver, Canada and author of When Courage Calls: Josephine Butler and the Radical Pursuit of Justice for Women

Fern Riddell, historian and writer. Her latest book is Victoria’s Secret: The Private Passion of a Queen (2025)

And Matthew Stallard, Research Associate from the Centre for the Study of the Legacies of British Slavery at University College London.

Producer: Eliane Glaser

Are we addicted to novelty? What are the cultural settings that allow innovation to flourish? And are novelty and innovation things we've always valued?

Tim Minshall is the author of Your Life is Manufactured.

Producer: Luke Mulhall

Are you planning your summer holiday? The first Saturday in January is called Sunshine Saturday because typically more holidays are booked on that day than on any other in the year. Today, planning a trip might involve consulting AI rather than reading a travel guide or visiting a travel agent. And the trip itself is more likely to involve an airplane than a stagecoach. But it's not just the practicalities of travel that have altered over the years. Reasons for travelling have changed, so have the meanings assigned to it. Was it ever a good vehicle for self discovery?

Producer: Luke Mulhall

Is idleness ever a virtue? In a world that seems to privilege utility and productivity above all else, Matthew Sweet considers whether we can rethink the importance of doing nothing. His guests for Radio 4's late night ideas discussion programme are:

Tom Hodgkinson, editor of The Idler and author of books including Idle Thoughts: Letters on Good Living, How to Live Like a Stoic: A Handbook for Happiness

Producer: Luke Mulhall

Do individuals or broader forces shape history? In the 2025 Reith lectures on BBC Radio 4, Rutger Bregman argues that small groups of individuals can have an outsize influence and he looks to examples in history from suffragism to the ending of slavery. In the Free Thinking studio for Radio 4's round-table discussion about the history of ideas, Matthew Sweet is joined by:

Anne Applebaum, Pulitzer prize winning historian and author of Autocracy Inc, which looks at the networks linking powerful people in our world

Producer: Eliane Glaser

Why marry? Jane Austen began her novel Pride and Prejudice with the observation "It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife". Recent figures from the Office of National Statistics show less than half the adult UK population are married or in a legal partnership and predictions are that by 2050, only 3 in 10 people in the UK will marry.

Shahidha Bari hosts Radio 4's round-table discussion programme Free Thinking, which brings together philosophical and historical insights in a conversation about issues resonating in the present day. Her guests this week are:

Producer: Luke Mulhall

Rocks have shaped the fates of civilizations and the study of geology has transformed our intellectual landscape. In the 19th century developments in earth sciences led to the scientific rejection of Biblical timescales in favour of the far greater spans of geological time, which opened the way for Darwin's development of the theory of evolution by natural selection. More recently, historians have been keen to incorporate factors like access to natural resources and major events like earthquakes and volcanic eruptions into their accounts of the past and analyses of the present. Matthew Sweet asks how disciplines in the humanities, like history and political theory, might be transformed by incorporating insights and data from the earth sciences, and also how the earth sciences might be transformed if they become more historically and culturally aware. With historians Peter Frankopan and Rosemary Hill, geologist Anjana Khatwa, philosopher Graham Harman, and poet Sarah Jackson.

Producer: Luke Mulhall

What function do ceremonies like Armistice Day perform? How do we balance desires for reconciliation with feelings about revenge? How we remember wars and what commemoration means is much less settled than we might think. And that throws up questions, in times when conflicts are spreading close to us in western Europe, of how wars end and how we balance our concern for justice and peace with darker impulses?

Joining presenter Anne McElvoy for BBC Radio 4's roundtable discussion about the ideas shaping our world are:

Producer: Ruth Watts

"Doom-prepping" tech billionaires have been in the headlines recently and whether it’s ecological crisis or a breakdown in law and order, fear of societal collapse seems to lurk in the background of a lot of discussion in politics and wider society. But what does it mean? When has it happened in the past? Can we avoid it – or survive it – in the future? Joining presenter Shahidha Bari for Radio 4's roundtable discussion about the ideas shaping our world are:

Producer: Luke Mulhall