John Humphrys invites four famous faces to answer questions in the infamous black chair. Hoping to show off their knowledge are MP David Lammy, Hairy Biker Dave Myers, actress and singer Toyah Willcox and actor David Harewoo

Four more celebrities face John Humphrys and try to answer questions in the infamous black chair. Having their knowledge put to the test are Crimewatch presenter Rav Wilding, Radio 1's Mark 'Chappers' Chapman, author Philippa Gregory and the impressionist Jon Culshaw.

John Humphrys puts the questions to famous contenders in a celebrity edition of Britain's toughest quiz. Having their knowledge put to the test are DJ Bob Harris, actor John Sessions, BBC newsreader Louise Minchin and journalist Andrew Neil

John Humphrys invites four celebrities to take the lonely walk to the black chair. Answering questions on their specialist subjects and general knowledge are actress Sally Lindsay, singer Mick Hucknall, West End star Summer Strallen and actor and comedian Mel Smith.

John Humphrys asks the questions in a celebrity version of television's toughest quiz. The famous faces being quizzed on their specialist subjects and general knowledge are actor Phil Daniels, musician Rick Wakeman, actor Ian Lavender and comedian Tim Vine.