BBC Four HD Tuesday

Liz McIvor discovers how carving up the landscape in order to build canals helped man's understanding of the earth below

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

Hyacinth visits a stately home, where she naturally tries her hardest to meet the lord of the manor. Suburban comedy, starring Patricia Routledge

Timothy Lumsden meets Annette at his amateur dramatics society, but all his attempts to court her are ruined by his mother. First episode of the comedy, starring Ronnie Corbett

Simon Schama looks back on his ambitious series, remembering the long debates over what to include and the search for apt locations

Historian Simon Schama charts the 4,000 years prior to 1000AD, from Stone Age Orkney through to the Roman occupation

A look at how, in the red-light district of Kolkata, a group of sex-working mothers are reclaiming their voices through the power of storytelling

Part one of two. Historian and MP Rory Stewart examines the impact and legacy of Hadrian's Wall, exploring the landscape, oral history and archaeology of the region

Dr Hannah Fry and a virtual host present a new way of making TV as the BBC's Research and Development uses Artificial intelligence to delve into the treasures of the BBC Archive

Liz McIvor discovers how carving up the landscape in order to build canals helped man's understanding of the earth below

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

Exploring the artificial intelligence required to replace human drivers, focusing on issues including the ethics of driverless car crashes and the impact on jobs