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1 hour, 15 minutes
First broadcast: on BBC One Northern IrelandLatest broadcast: on BBC One Wales
Clare Balding puts six clever contestants through a series of nail-biting challenges that test everything from their emotional intelligence to their ability to multitask. Show more
Clare Balding is joined by comedian Bill Bailey as five finalists fight it out for a prize of 50,000 pounds and the title Britain's Brightest.
1 hour, 15 minutes
First broadcast: on BBC One ScotlandLatest broadcast: on BBC One HD
Clare Balding puts six clever contestants through a series of nail-biting challenges, including a number puzzle featuring acrobats on a giant trampoline and Stop the Clock. Show more
1 hour, 15 minutes
First broadcast: on BBC One HDLatest broadcast: on BBC One Wales
Clare Balding puts six clever contestants through a series of nail-biting challenges, including being locked in a room and racing to be the first to solve the puzzles inside. Show more
1 hour, 15 minutes
First broadcast: on BBC One North WestLatest broadcast: on BBC One Wales
Six more contestants tackle a series of extraordinary challenges in the hope that their brightness can win them a prize of £50,000. Hosted by Clare Balding.
Pop group Madness, comedian Milton Jones and a German bottle band are some of the challenges facing the players chasing the last place in the 50,000-pounds final. Show more
