BBC Four Wednesday

Part one of two. Michael Portillo rides the transcontinental Indian Pacific Railway from the southern port city of Adelaide to Perth in the west

Robbie Cumming navigates the River Severn, and takes an unexpected bath as he tumbles at the Tardebigge lock flight in Worcestershire

A two-part documentary, which explores studies that have uncovered how plants are able to smell, touch and taste

Ted Green explores a 600-year-old oak tree in the grounds of Windsor Great Park. Featuring time-lapse and macro photography highlighting the creatures who depend on it

A documentary about Thomas Hardy's Dorset with Sir Michael Hordern. First broadcast 17 September 1992

Dr Bill Greenslade examines the treasure trove of secret notebooks kept by author Thomas Hardy, revealing how the Victorian writer found inspiration for some of his classic works

Angel learns about Tess's past while on honeymoon and decides they must separate. She then finds a job on a farm run by Groby and bumps into Alec, who proposes marriage

The death of Tess's father sees her family forced out of their house, and she finds herself at the mercy of Alec, who offers the Durbeyfields a home and support

The documentary examines race and colonialism, including the books Robinson Crusoe, Uncle Tom's Cabin, Wide Sargasso Sea, The Lonely Londoners, Kim and Noughts and Crosses

Part one of two. Michael Portillo rides the transcontinental Indian Pacific Railway from the southern port city of Adelaide to Perth in the west

Robbie Cumming navigates the River Severn, and takes an unexpected bath as he tumbles at the Tardebigge lock flight in Worcestershire

A documentary about Thomas Hardy's Dorset with Sir Michael Hordern. First broadcast 17 September 1992

Dr Bill Greenslade examines the treasure trove of secret notebooks kept by author Thomas Hardy, revealing how the Victorian writer found inspiration for some of his classic works

A two-part documentary, which explores studies that have uncovered how plants are able to smell, touch and taste