BBC Four HD 2026-08-12 Programmes start at 7.00pm. [HD] 2026-08-12 2/10. Tim Dunn visits the Ffestiniog in Wales, originally built to transport slate from mountain to coast, and learns about Amsterdam Centraal. [S,AD] [HD] 2026-08-12 Chris Beardshaw follows in the footsteps of the Scottish adventurers who travelled the globe and risked their lives to bring back plants that are now taken for granted. [S,AD] 2026-08-12 2/8. Audrey moves out of Grantleigh Manor. Her hopes of seeing the estate run along old lines are dashed when she discovers the new owner's background. [S] 2026-08-12 1/7. Richard is far from happy when Hyacinth concocts an elaborate plan to turn him into a Frosticle executive with the help of a chukka of golf! [S] 2026-08-12 Ardal O'Hanlon explores a 1930s quest to find the first Irish men and women using archaeology, answering his deepest questions about what it means to be Irish. [S] [HD] 2026-08-12 Japanese and US veterans reflect on the 'kamikaze' attacks of World War II, which killed thousands of Japanese airmen and Allied military personnel. [S] [HD] 2026-08-12 Professor Brian Cox joins the team to explore the mind-bending mysteries of black holes discovered by the James Webb Space Telescope's most exciting new observations. [S] [HD] 2026-08-12 10/17. A look at the fledgling field of extraterrestrial meteorology. [S] [HD] 2026-08-12 Art critic Matt Collings explores the most famous equations in science and realises that concepts of beauty and elegance have been used by many scientists to advance their work. [S] 2026-08-12 Chris Beardshaw follows in the footsteps of the Scottish adventurers who travelled the globe and risked their lives to bring back plants that are now taken for granted. [S,AD] 2026-08-12 Ardal O'Hanlon explores a 1930s quest to find the first Irish men and women using archaeology, answering his deepest questions about what it means to be Irish. [S] [HD] 2026-08-12 Programmes start at 7.00pm. [HD] 2026-08-12 2026-08-12 2026-08-12 2026-08-13 Programmes start at 7.00pm. [HD] 2026-08-13 1/10. Ben Robinson visits Culross, a stunning 17th-century village that was a major centre for Scottish coal mining and the first underwater sea coal shaft in the world. [S] [HD] 2026-08-13 3/4. Series in which Julia Bradbury explores the work of fell walker and author Alfred Wainwright. Julia is in the Borrowdale Valley to climb to the summit of Castle Crag. [S,AD] 2026-08-13 3/3. Alastair Sooke charts the fall of the Roman Empire through some of its artistic treasures, including one of the best preserved Roman cities in Libya. [S] [HD] 2026-08-13 2/4. Mary Beard explores the physical world of the Roman Empire. [S,AD] [HD] 2026-08-13 5/12. The situation in the east now threatens Tiberius's position as emperor. Deals with adult themes. [S] 2026-08-13 6/12. Series chronicling the reigns of four Roman emperors. Germanicus has been murdered in Antioch, and his wife Agrippina is convinced Tiberius ordered the killing. Deals with adult themes. [S] 2026-08-13 3/3. Alastair Sooke charts the fall of the Roman Empire through some of its artistic treasures, including one of the best preserved Roman cities in Libya. [S] [HD] 2026-08-13 A remarkable journey into the secret world of bats. Cutting-edge night-vision cameras follow the hidden life of a greater horseshoe bat roost for four months. [S,AD] [HD] 2026-08-13 3/4. Series in which Julia Bradbury explores the work of fell walker and author Alfred Wainwright. Julia is in the Borrowdale Valley to climb to the summit of Castle Crag. [S,AD] 2026-08-13 1/10. Ben Robinson visits Culross, a stunning 17th-century village that was a major centre for Scottish coal mining and the first underwater sea coal shaft in the world. [S,SL] [HD] 2026-08-13 2/4. Mary Beard explores the physical world of the Roman Empire. [S,AD,SL] [HD] 2026-08-13 Programmes start at 7.00pm. [HD] 2026-08-13 2026-08-13 2026-08-13