BBC Four HD

Programmes start at 7.00pm.

Ben Garrod shows how bone can support animals that are both minuscule and massive. Contains some scenes which some viewers may find upsetting.

When Diana's niece Sarah goes into labour, both Tom and Diana are needed - despite Diana's protestations of of being too squeamish.

Arthur arrives as usual to help out on the Grantleigh estate, but Audrey can't give him work.

Suburban sitcom. Hyacinth suddenly has a lot on her hands - attending the mayor's fancy dress ball and getting to know an important new neighbour.

Thomas Cromwell is revealed as a revolutionary who laid the foundations of modern Britain.

A raw tribute celebrating the late Scottish-Kenyan singer-songwriter Beldina Odenyo. Contains very strong language.

Dan Cruickshank presents a documentary revealing the story of the Dalai Lama, his secret Himalayan kingdom and his exile, using eyewitness accounts and colour archive footage.

Ben Garrod shows how bone can support animals that are both minuscule and massive. Contains some scenes which some viewers may find upsetting.

Anita Brookner shares her unique insights on works by the world's greatest painters.

Dan Cruickshank presents a documentary revealing the story of the Dalai Lama, his secret Himalayan kingdom and his exile, using eyewitness accounts and colour archive footage.

Archaeologist Ben Robinson explores London, the ultimate 'city of villages', including a new breed of urban villages like Crouch End and Walthamstow.

Programmes start at 7.00pm.

Programmes start at 7.00pm.

Ben Garrod discovers how the skeleton has adapted for vertebrates to move on land in many ways and explores the role of the spine in both cheetahs and snakes.

Timothy Spall and his wife Shane take their barge to three different countries and visit Rafe Spall on the Isle of Man. In Belfast, Tim visits one of his favourite pubs.

Documentary film that investigates the importance of caves throughout British history and heads inside the deepest shaft ever discovered in Britain - Titan.

Artist Derek Jarman returns to his former art master's house in Wimborne, Dorset, which he helped to build.

How we develop new skills, from riding a bike to learning to walk.

A strange young man turns up on Elizabeth's doorstep and makes a frightening claim. Dennis Potter's play starring Tim Curry, Anna Cropper and Bob Hoskins.

Alice Roberts swims in cavernous plunge pools, languid rivers and underground lakes to examine the passion for wild water swimming, following the classic swimming text Waterlog.