BBC Four HD SkyTV

Programmes start at 7.00pm. [HD]

35/37. The semi-finals of the tournament begin. The first of the four remaining teams do battle for a place in the series final. Jeremy Paxman asks the questions. [S] [HD]

12/15. Quiz show in which connections must be made between seemingly random subjects. Three gamblers take on a team unified by their love of ten-pin bowling. [S] [HD]

Adjoa Andoh presents an appeal on behalf of the Disasters Emergency Committee for those affected by the Venezuelan Earthquakes. [S] [HD]

4/5. Professor Brian Cox journeys into a supermassive black hole - a monster that can destroy worlds and stop time, and which is forcing us to reassess our understanding of reality. [S,AD] [HD]

4/6. An insight into the Nazis' reign of terror in Poland. Contains some scenes which some viewers may find upsetting. [S]

Lucinda Lambton visits Europe's last ornamental farm, at Larchill, west of Dublin. It features rustic follies, great lakes and a glorious collection of animals. [S]

.. Our Friends in the North. Christopher Eccleston reflects on the making of Peter Flannery's acclaimed 1996 drama. Contains some strong language. [S] [HD]

4/9. The friends' reunion is a disaster. Contains some strong language. [S]

5/9. The world has turned sour for the gang. Geordie is in jail, and Tosker works in a factory. Contains some strong language and some scenes of a sexual nature. [S]

12/15. Quiz show in which connections must be made between seemingly random subjects. Three gamblers take on a team unified by their love of ten-pin bowling. [S] [HD]

4/6. An insight into the Nazis' reign of terror in Poland. Contains some scenes which some viewers may find upsetting. [S]

4/5. Professor Brian Cox journeys into a supermassive black hole - a monster that can destroy worlds and stop time, and which is forcing us to reassess our understanding of reality. [S,AD,SL] [HD]

Programmes start at 7.00pm. [HD]

Programmes start at 7.00pm. [HD]

36/37. In the second of the series semi-finals, two more teams of students face off for a place in the grand final. Jeremy Paxman asks the questions. [S] [HD]

13/15. Quiz show with Victoria Coren. In the first semi-final, three lovers of the pastoral world of The Archers face a team of confirmed gamblers. [S] [HD]

Classic period drama about three children whose lives change dramatically after they move from a comfortable townhouse to a small Yorkshire cottage near a railway line. [1970] [S,AD]

Ben Fogle travels to West Yorkshire with actress Sally Thomsett to visit the locations of key scenes from the classic 1970 film The Railway Children. [S]

A power repairman has an encounter with a spacecraft and is obsessed with seeing it again. Contains language which some may find offensive. [1980] [S,AD] [HD]

13/15. Quiz show with Victoria Coren. In the first semi-final, three lovers of the pastoral world of The Archers face a team of confirmed gamblers. [S] [HD]

Grammy-winning sensation Samara Joy sings timeless and much-loved classics. [S] [HD]

Programmes start at 7.00pm. [HD]

Programmes start at 7.00pm. [HD]

Jamie Theakston presents the pop chart programme, featuring Pet Shop Boys, Donell Jones, Point Break, Missy 'Misdemeanor' Elliott, Eurythmics, Scooch and Manic Street Preachers. [S]

Jamie Theakston presents the pop chart programme, featuring Donell Jones, Nu Generation, Super Furry Animals, Hi-Gate, Manic Street Preachers, Scanty Sandwich and Britney Spears. [S]

Janice Long presents the pop chart programme, first broadcast on 3 July 1986. Featuring The Housemartins, Samantha Fox, Claire & Friends, Sly Fox, Gary Numan, Bucks Fizz and Wham! [S]

Nicky Campbell presents the pop chart programme, first broadcast on 6 July 1989 and featuring Sonia, Monie Love and The Beautiful South. [S]

As Adam Frost's brand new garden starts to take shape, it's time to get some shrubs in the ground and construct a path. [S] [HD]

Legendary and newer US singer-songwriters - including Jackson Browne, Nanci Griffith and Loudon Wainwright - perform one of their key songs and explain how they came to write it. [S]

Jackson Browne in a live concert from the BBC Television Theatre, London. Introduced by Bob Harris. [S]

...and Mary Chapin Carpenter: Bottom Line. An acoustic performance by Nanci Griffith, Rosanne Cash and Mary-Chapin Carpenter. [S]