BBC Four HD SkyTV

Programmes start at 7.00pm. [HD]

3/15. Dr Jonathan Foyle scales Britain's most iconic structures to reveal the buildings' secrets. Next up is Caernarfon Castle, built in 1283. [S,AD] [HD]

Award-winning stage, film and TV actress Allison Janney traces her family tree and uncovers a remarkable story that ties her to some of America's first British settlers. [S,AD] [HD]

5/6. Michael Palin continues his Himalayan trek. Palin reaches the easternmost end of the Himalayas, exploring medieval Lijiang. [S,AD]

The unknown story of the worst child-poisoning case since thalidomide, featuring a landmark legal battle by a group of mothers determined to uncover the truth. [S,AD] [HD]

Vivien Heilbron looks back on the 1983 BBC adaptation of Lewis Grassic Gibbon's novel. [S] [HD]

1/3. After her second husband's death, Chris Guthrie moves to Duncairn and buys a half-share in a guest house. Ewan is drawn to socialism and is increasingly radicalised. [S]

2/3. A familiar face arrives from Segget and takes a room at the guest house. Ewan and Ellen's political ambitions ramp up, and Ma Cleghorn's health threatens Chris's future. [S]

3/3. Chris accepts a proposal in order to save the guesthouse. A death at the foundry sees Ewan framed and violently arrested. [S]

3/15. Dr Jonathan Foyle scales Britain's most iconic structures to reveal the buildings' secrets. Next up is Caernarfon Castle, built in 1283. [S,AD] [HD]

Award-winning stage, film and TV actress Allison Janney traces her family tree and uncovers a remarkable story that ties her to some of America's first British settlers. [S,AD] [HD]

5/6. Michael Palin continues his Himalayan trek. Palin reaches the easternmost end of the Himalayas, exploring medieval Lijiang. [S,AD,SL]

Programmes start at 7.00pm. [HD]

Programmes start at 7.00pm. [HD]

4/15. Dr Jonathan Foyle scales Britain's most iconic structures to reveal the buildings' secrets. Jonathan's journey takes him to the 'dreaming spires' of New College in Oxford. [S,AD] [HD]

Actor Chris O'Donnell traces the ancestry of his late father, discovering a legacy of courage, patriotism and proud devotion to family. [S,AD] [HD]

Espionage thriller based on the true story of an intelligence officer who plans an elaborate hoax to fool the Nazis into thinking the Allies are about to invade Greece, not Sicily. [1956] [S]

In a programme from 1976, actor Robert Redford talks with Melvyn Bragg about America, politics, ecology and movies. [S]

Two Washington Post reporters uncover the Watergate scandal - a conspiracy to cover up abuses of power by President Nixon. Contains strong language. [1976] [S,AD] [HD]