4/5 Prof Roberta Gilchrist discusses the place of women in the history of British castles.
3/5 Benjamin Wild recounts the siege of Kenilworth castle - the longest in English history.
2/5 Nicola Coldstream explores the careers of two master masons.
1/5 Professor Jeremy Black considers the primary military function of castles.
5/5 Geneticist Sir Paul Nurse discusses the book Conjectures and Refutations by Karl Popper.
4/5 Actress and playwright Lolita Chakrabarti on Charles Dickens's book A Tale of Two Cities.
3/5 Journalist and writer Jon Ronson discusses Jonathan Coe's book What a Carve Up!
2/5 Jude Kelly of London's Southbank Centre discusses Little Women by Louisa May Alcott.
1/5 Musician and singer Steve Earle discusses the book In Cold Blood by Truman Capote.
5/5 Polly Coles discusses the boat-loving residents of Venice.