BBC Four HD

Programmes start at 7.00pm.

What makes sharks built for speed? How do snakes move without limbs? How do sugar gliders fly without feathers? The answers all lie in their skin.

Rugby legend Gareth and wife Maureen visit their top family holiday spot, St Davids.

Stately sitcom. Audrey upbraids Richard for not sponsoring a charity event in aid of a new scout hut.

Sitcom. Hyacinth has decided that, instead of her usual gift to Richard of slippers, he should receive skis instead. Richard, however, has no intention of taking up the sport.

Documentary series. Robert Bartlett explores the impact of the Norman conquest of Britain and Ireland, and looks at how England adapted to its new masters.

The remarkable story of the Harlem photographer, activist and cultural pioneer Kwame Brathwaite, whose work helped define the Black Is Beautiful movement.

Professor Jim Al-Khalili tells the story of how we went from thinking we were close to a complete understanding of the universe to realising we had seen almost none of it.

What makes sharks built for speed? How do snakes move without limbs? How do sugar gliders fly without feathers? The answers all lie in their skin.

Rugby legend Gareth and wife Maureen visit their top family holiday spot, St Davids.

In the last of the series, archaeologist and historian Richard Miles examines the rise and fall of the Roman Empire.

Documentary series. Robert Bartlett explores the impact of the Norman conquest of Britain and Ireland, and looks at how England adapted to its new masters.

Programmes start at 7.00pm.

Programmes start at 7.00pm.

Professor Ben Garrod reveals how skin protects vertebrates from extremes of temperature, the harmful effect of UV and a host of living organisms that want to get in.

Gareth and Maureen enlist in tank school and gear up for a drive like no other. In the Brecon Beacons, they discover if they've finally cracked the art of narrowboating.

Documentary that explores Emperor Augustus's Alpine campaign, revealing for the first time the route, weapons and tactics used by the Romans to successfully annex the unconquered Alps.

Architect Sand Helsel applauds Trellick Tower, a brutalist tower block in west London, designed by Erno Goldfinger and completed in 1972.

Brian Cox explores a planet that dwarfs all the others: Jupiter.

Marlow is getting better, and the different strands of his fiction and reality begin to occupy the same time and place. Contains some strong language and some scenes of a sexual nature.

Marlow still dreams about the homecoming and the frightening figure of the scarecrow. Deals with adult themes.

Documentary that re-examines the attempt to blow up the Houses of Parliament in 1605. Computer graphics recreate the scene and show how close the plotters came to success.

Professor Ben Garrod reveals how skin protects vertebrates from extremes of temperature, the harmful effect of UV and a host of living organisms that want to get in.

Gareth and Maureen enlist in tank school and gear up for a drive like no other. In the Brecon Beacons, they discover if they've finally cracked the art of narrowboating.

Brian Cox explores a planet that dwarfs all the others: Jupiter.

Programmes start at 7.00pm.

Programmes start at 7.00pm.

Peter and Dan Snow take an in-depth look at the battles that shaped our nation. The Battle of Britain was the pivotal air battle of World War II.

A group of crack commandos during the Second World War attempt to destroy the formidable German artillery on the Greek island of Navarone. Starring Gregory Peck and David Niven.

Horror-suspense story about Michael Myers, a murderous lunatic who escapes incarceration. Contains some violence and disturbing scenes.