Kirsty Young tells the story of the long-running programme as it celebrates its 70th anniversary and investigates what has made it such an enduring part of the radio schedule. In addition to hearing some classic clips from some amazing castaways, Kirsty talks to BBC historian Professor Jean Seaton, former castaway Mary Portas and is also joined by her predecessors, Sue Lawley and Sir Michael Parkinson and, from the archives, by Roy Plomley himself.

Producer: Isabel Sargent.