BBC Four HD Wednesday

Michael Portillo travels to leafy Hatch End in north-west London, where he meets the great-nephew of the famous illustrator William Heath Robinson

Julia Bradbury travels by boat and foot as she learns about the history of Catbells fell, situated on the shore of Derwentwater near the Lakeland town of Keswick

The natural forces that underpin life in the Atlantic, from the huge pods of dolphins and massive penguin colonies in the South Atlantic to the bizarre creatures found down below

Maritime historian Dr Sam Willis learns about mutiny, murder and mayhem as he charts the stories behind the shipwrecks of the Georgian age

The actress reminisces on Dennis Potter's influential 1986 drama, from working with leading man Michael Gambon and the pride of working on a piece that got everyone talking

Dennis Potter's surreal 1986 drama, starring Michael Gambon as a novelist who begins to mentally assume the role of one of his characters while confined to a hospital bed

Marlow clashes with Dr Gibbon, a hospital psychiatrist who has read one of his novels and thinks he can get to the root of his problems. Dennis Potter's drama, with Michael Gambon

Marlow is shocked when one of his fellow patients dies - and as his mental state becomes increasingly fragile, he is haunted by childhood memories of his mother

Michael Portillo travels to leafy Hatch End in north-west London, where he meets the great-nephew of the famous illustrator William Heath Robinson

Julia Bradbury travels by boat and foot as she learns about the history of Catbells fell, situated on the shore of Derwentwater near the Lakeland town of Keswick

The natural forces that underpin life in the Atlantic, from the huge pods of dolphins and massive penguin colonies in the South Atlantic to the bizarre creatures found down below