BBC Four HD SkyTV

Programmes start at 7.00pm. [HD]

21/37. With half the quarter-final places filled, two more teams of students return for a second-round match. Jeremy Paxman asks the questions. [S] [HD]

6/8. Quiz in which connections must be made between seemingly random elements. How does Carmilla link to Neo via Lord Voldemort and Sir Leigh Teabing? [S]

4/4. Art historian Rose Balston creates a television history of John Constable. [S] [HD]

2/3. Andrew Graham-Dixon discovers how the ambitions of visionary artists and architects helped America remove itself from the shadow of Europe in the 20th century. [S,AD] [HD]

The team uncover a danger that humanity is only just waking up to - space weather. They meet the dedicated people working to keep us safe from the very worst that the sun can throw at us. [S] [HD]

3/8. Art critic Robert Hughes looks at America's majestic landscapes, exploring how artists have contributed to the religious and patriotic connotations of nature. [S]

1/3. Simon Sebag Montefiore looks at the Habsburgs' rise to power and how Vienna marked Europe's front line in the struggle to defend both Christendom and the Catholic church. [S,AD] [HD]

Dr James Fox takes a journey through six different landscapes across Britain, meeting artists whose work explores our relationship to the natural world. [S,AD] [HD]

6/8. Quiz in which connections must be made between seemingly random elements. How does Carmilla link to Neo via Lord Voldemort and Sir Leigh Teabing? [S]

2/3. Andrew Graham-Dixon discovers how the ambitions of visionary artists and architects helped America remove itself from the shadow of Europe in the 20th century. [S,AD,SL]

Programmes start at 7.00pm. [HD]

Programmes start at 7.00pm. [HD]

22/37. Two more teams of students return for a second-round match, with three places in the quarter-finals still up for grabs. Jeremy Paxman asks the questions. [S] [HD]

7/8. Quiz in which connections must be made between seemingly random elements sees the battle for third place in the series. [S]

9/10. Comedy of social manners. Hyacinth wants her neighbours to see the arrival of her new suite, boasting that it's an exact replica of one at Sandringham House. [S]

10/10. Sitcom about an irrepressible snob. Hyacinth's plan to take Daddy on a picnic backfires when he takes the car, leaving the rest of the family stranded. [S]

3/4. How the liberal politics and free-market economics of the British Empire unravelled, leading to the potato famine in Ireland and mutiny in India. [S,AD]

5/8. Muhammad Ali returns from exile to face his greatest rival, Joe Frazier. Contains scenes which some viewers may find upsetting. [S,AD] [HD]

6/8. Ali battles to complete his comeback after his conviction is overturned. Contains scenes which some viewers may find upsetting. [S,AD] [HD]

7/8. Muhammad Ali shocks the world by defeating George Foreman, winning back the heavyweight title and becoming the most famous man on earth. [S,AD] [HD]