Four more celebrities face John Humphrys and try to answer questions in the black chair. The contenders hoping to show off their knowledge are newsreader Alastair Stewart, naturalist Steve Backshall, Radio 1 DJ Comedy Dave Vitty and the entrepreneur Saira Khan.
Tonight's subjects are:
*The Rolling Stones*
*Judo*
*British Motorways*
*The Life & Works of Coco Chanel*
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