BBC Four HD SkyTV

Programmes start at 7.00pm. [HD]

14/15. Michael finds out about the impact of a famous Enoch Powell speech across the nation. [S,AD] [HD]

1/5. Rugby legend Gareth Edwards and wife Maureen try steam trains and rallying in Machynlleth. [S] [HD]

4/4. Brian explores the enigma of time - a phenomenon that we take for granted but which, as far as physicists are concerned, is one of the biggest mysteries in the universe. [S,AD] [HD]

4/6. Bruce Parry spends time with the Akie people of Tanzania, who live on the savannah. Contains some strong language. [S,AD]

Sir Derek Jacobi looks back on the 1997 BBC drama about mathematician Alan Turing. [S] [HD]

Factual drama about Alan Turing, the mathematical genius who cracked the Enigma code. Deals with adult themes. [S]

2/3. Sam Willis tells the story of the English ruler who left the most indelible mark on the castle, Edward I, as he turned it into an instrument of colonisation. [S,AD] [HD]

14/15. Michael finds out about the impact of a famous Enoch Powell speech across the nation. [S,AD] [HD]

1/5. Rugby legend Gareth Edwards and wife Maureen try steam trains and rallying in Machynlleth. [S] [HD]

4/6. Bruce Parry spends time with the Akie people of Tanzania, who live on the savannah. Contains some strong language. [S,AD]

4/4. Brian explores one of the greatest mysteries in physics today - what is time? [S,AD,SL] [HD]

Programmes start at 7.00pm. [HD]

Programmes start at 7.00pm. [HD]

15/15. Michael visits the fairy-tale castle of Eastnor at the foot of the Malvern Hills, before heading to the Severn Estuary and Filton, the centre of Britain's postwar aviation industry. [S,AD] [HD]

2/5. The Edwards mark their 49th wedding anniversary in the picturesque seaside town of Tenby. [S] [HD]

2/6. Dr Helen Czerski looks at volcanoes. New thermal imagery and ultra high-speed photography capture the complex processes crucial to understanding how and why they erupt. [S] [HD]

Celia Imrie tells the story behind one of the most groundbreaking and influential films of the sixties, 1967's Bonnie and Clyde, starring Warren Beatty and Faye Dunaway. [S] [HD]

Clyde Barrow and Bonnie Parker achieve growing notoriety as they carry out a series of robberies with their gang in 1930s America. Contains some violent scenes. [1967] [S,AD]

Timewatch goes in search of the true story of Bonnie and Clyde, with unprecedented access to gang members' memoirs, family archives and police records. [S] [HD]

Margy Kinmonth meets millionaire customers and world-famous designers as she explores the anachronistic but little-explained pocket of the fashion industry known as haute couture. [S,AD]