BBC Four HD 2026-04-02 Programmes start at 7.00pm. [HD] 2026-04-02 5/6. Fred Dibnah looks at some of the great achievements in civil engineering, from the earliest wrought iron suspension bridge to the Channel Tunnel. [S] 2026-04-02 2/4. Comedian and actor Nina Wadia enjoys an invigorating spring walk in the Yorkshire Dales. A 360-degree camera captures her thoughts and emotions along the way. [S] [HD] 2026-04-02 A professor develops an extraordinary relationship with an octopus when he invites it to live in his home to learn about its intelligence. [S,AD] [HD] 2026-04-02 Documentary following the work of scientists at archaeological marvel the Chauvet cave. [S] [HD] 2026-04-02 5/11. Egg takes his work worries to a therapist but finds that football is the only way forward. Contains some strong language. [S] 2026-04-02 6/11. Warren fears that Kira might 'out' him to the rest of the family, Anna tries her hand at marriage guidance, and Miles beats his father at his own game. Contains some strong language. [S] 2026-04-02 1/3. Gabriel Weston looks at the difficulty of identifying the body in a murder case. Contains some scenes which some viewers may find upsetting. [S,AD] [HD] 2026-04-02 5/6. Fred Dibnah looks at some of the great achievements in civil engineering, from the earliest wrought iron suspension bridge to the Channel Tunnel. [S] 2026-04-02 2/4. Comedian and actor Nina Wadia enjoys an invigorating spring walk in the Yorkshire Dales. A 360-degree camera captures her thoughts and emotions along the way. [S] [HD] 2026-04-02 A professor develops an extraordinary relationship with an octopus when he invites it to live in his home to learn about its intelligence. [S,AD] [HD] 2026-04-02 1/3. Gabriel Weston looks at the difficulty of identifying the body in a murder case. Contains some scenes which some viewers may find upsetting. [S,AD,SL] 2026-04-02 Programmes start at 7.00pm. [HD] 2026-04-02 2026-04-02 2026-04-02 2026-04-03 Programmes start at 7.00pm. [HD] 2026-04-03 6/6. Steeplejack Fred Dibnah tours Britain admiring some of its engineering marvels. This edition focuses on structures that have been built for entertainment purposes. [S] 2026-04-03 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. [S] [HD] 2026-04-03 Classic Oscar-winning drama. An ageing star is duped into helping an aspiring actress, who turns out to be ruthlessly ambitious. [1950] [S] 2026-04-03 Classic interview from 1987 in which Terry Wogan talks to Hollywood legend Bette Davis. [S] [HD] 2026-04-03 Spy thriller about an investigation into a brain drain among scientists. A secret agent finds himself in a world where nobody can be trusted. [1965] [S,AD] [HD] 2026-04-03 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. [S] 2026-04-03 Uninterrupted and unspoiled by voiceover or music, the birdsong of sunrise in all its glory. Three different habitats, Britain's woodland, heathland and parkland, burst into song. [S] [HD] 2026-04-03 6/6. Steeplejack Fred Dibnah tours Britain admiring some of its engineering marvels. This edition focuses on structures that have been built for entertainment purposes. [S] 2026-04-03 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. [S] [HD] 2026-04-03 Programmes start at 7.00pm. [HD] 2026-04-03 2026-04-03 2026-04-03