BBC Four HD Poet John Wedgwood Clarke explores the Red River in Cornwall. Despite being heavily polluted by centuries of tin mining, it is also home to some rare, beautiful and resilient wildlife. 2026-04-02 Classic Oscar-winning drama. An ageing star is duped into helping an aspiring actress, who turns out to be ruthlessly ambitious. 2026-04-02 Classic interview from 1987 in which Terry Wogan talks to Hollywood legend Bette Davis. 2026-04-02 Spy thriller about an investigation into a brain drain among scientists. A secret agent finds himself in a world where nobody can be trusted. 2026-04-02 Profile of best-selling author Len Deighton, whose output ranges from the Harry Palmer espionage thrillers to books on military history and cookery. First shown in 2006. 2026-04-02