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Alan completes the final leg of his journey by returning to Hong Kong. (R)
The 1920s saw a housing boom, the creation of the BBC and the Wall Street Crash.
Series Catch-up
The assassination of an archduke in Sarajevo sets in motion the wheels of world war. (R)
Series Catch-up
Bouncer Boy receives a joke kit and spends the day trying out the tricks on Nev.
After Keith the koala is mistaken for a rodent, Caretaker Prank gets a Robot Rat Catcher.
Simon remembers his involvement in the 1998 Eurovision Song Contest in Birmingham.
Series Catch-up
Simon recalls unearthing a terrible secret about his parents' marriage.
Series Catch-up
Looking at the architecture of Berlin and its Imperial, Nazi and Communist associations.
Series Catch-up
Examining the legacy of 18th-century king Frederick the Great.
Series Catch-up
The F2s wait anxiously for the results of the postmortem - are they guilty?
Paul enters an unsuspecting Barry into a hidden camera TV show.
With the arrival of new residents the women of the town are sparkling with anticipation. (R)
It is Halloween and feverish hallucinations jeopardize the lives of the crew.
Mars, 2059. Bowie Base One. Last recorded message: 'Don't drink the water. Not one drop.'.
It's 1913 and war comes to England early, as the terrifying Family hunt for the Doctor. (R)
Jimmi helps a serial runaway groom confront his fears and be honest with his future bride.
Heston tries to make an elderly patient's wayward grandson attend his mother's funeral.
Featuring a man who gets his jeans stolen from a shop changing room. (R)
Series Catch-up
Featuring a hotel guest who, in spite of his innocence, is billed for watching porn. (R)
Series Catch-up
Featuring a client who gets her coat set on fire by her hairdresser. (R)
Series Catch-up
Ricky and Bianca share a magical moment at the Children in Need dance competition.
Garrow successfully defends the detestable Edgar Cole much to Lady Sarah's disappointment.
Series Catch-up
Garrow, now a celebrated Old Bailey barrister, defends the case of the infamous Monster. (R)
Series Catch-up
Young, idealistic barrister William Garrow is instructed to defend a helpless serving girl (R)
Series Catch-up
Diarmaid MacCulloch explores Eastern Orthodox Christianity's fight for survival.
Series Catch-up
Diarmaid MacCulloch explores the extraordinary rise of Roman Catholic Church.
Series Catch-up
Diarmaid MacCulloch shows how Christianity's origins lie east of Jerusalem and Rome. (R)
Series Catch-up
Horizon investigates speech, a phenomenon unique to humans, which remains a mystery.
Series Catch-up
What was there before the Big Bang? Black holes could hold the answer. (R)
Series Catch-up
Three people with untreatable conditions see if, within their lifetime, they can be cured. (R)
Series Catch-up
Addiction expert John Marsden explores our relationship with alcohol. (R)
Series Catch-up
James attempts to build a three-mile-long Scalextric track at Brooklands in Surrey.
Series Catch-up
James teams up with Edwina Currie to build a full-size bridge from nothing but Meccano.
Series Catch-up
James May tries to make a full-size Spitfire out of Airfix. Are the pieces strong enough? (R)
Series Catch-up
Jimmy attempts to mix his own cola syrup and make hoop-shaped potato snacks.
Jimmy tries to copy some of the methods that food companies use to preserve food.
Series Catch-up
Jimmy tries to discover what happens to milk before it arrives on the supermarket shelf. (R)
Series Catch-up
Jimmy tries to discover what really goes into supermarket sandwiches. (R)
Series Catch-up
Farmer Jimmy Doherty makes breakfast from scratch, looking at cornflakes and coffee. (R)
Series Catch-up
Super slow motion shows a bombardier beetle firing boiling liquid at its enemies.
Series Catch-up
How mammals dominate the planet through having warm blood and by caring for their young. (R)
Series Catch-up
A look at the strategies used by reptiles and amphibians to conquer their shortcomings. (R)
Series Catch-up
A look at how some animals and plants go to extremes to give themselves a chance to breed. (R)
Series Catch-up
Merlin helps the beautiful druid girl Freya escape from a bounty hunter's cage.
Series Catch-up
A mysterious warrior challenging Arthur to a duel starts a devastating chain of events.
Series Catch-up
Determined to rid Camelot of magic, Uther summons the most feared witchfinder in the land. (R)
Series Catch-up
Uther is captivated by the beautiful Lady Catrina, who Merlin suspects to be a troll. (R)
Series Catch-up
Gwen is mistaken for Morgana and kidnapped. Arthur heads out to fight for her freedom. (R)
Series Catch-up
Merlin helps Arthur disguise his identity to enter a jousting tournament. (R)
Series Catch-up
New servant Cedric muscles in on Merlin's position as Arthur's right-hand man. (R)
Series Catch-up