BBC Four HD Tuesday

Biologist Ben Garrod examines how animals use their skin to send out messages to their own species, and warning signals to others

In the first of two Dylan Thomas specials, Derek Brockway strolls around the poet's home town of Swansea, then through the countryside that inspired him

Audrey leads locals in a rally against the proposed closure of the village railway station. Guest starring Richard Thorp

Hyacinth attends an exclusive auction, while Daisy and Rose have problems with a woman who is determined to marry Daddy

The expansion towards southern Europe and the Middle East in the 11th century, which began with the conquest of Sicily and culminated in the First Crusade

Hasan Kattan and Fadi Al-Halabi navigate the reality of the UK asylum system, documenting a new chapter in their own lives shaped by uncertainty, bureaucracy and displacement

The wife of a Russian opposition politician and journalist mounts a global campaign to bring her husband home after he was arrested for speaking out against the invasion of Ukraine

Part one of two. Jim Al-Khalili explores the universe at the smallest scales, from tiny atoms to vast galaxies, examining objects too small to glimpse with the naked eye

Biologist Ben Garrod examines how animals use their skin to send out messages to their own species, and warning signals to others

In the first of two Dylan Thomas specials, Derek Brockway strolls around the poet's home town of Swansea, then through the countryside that inspired him

The expansion towards southern Europe and the Middle East in the 11th century, which began with the conquest of Sicily and culminated in the First Crusade

Part one of two. Jim Al-Khalili explores the universe at the smallest scales, from tiny atoms to vast galaxies, examining objects too small to glimpse with the naked eye