Hal Cruttenden, Clare Perkins, Sophie Hosking, Huw Stephens

John Humphrys presents the celebrity version of Britain's toughest quiz. Four more celebrities take on the Mastermind challenge as comedian Hal Cruttenden, actress Clare Perkins, Olympic gold medal-winning rower Sophie Hosking and Radio 1 DJ Huw Stephens answer questions on the Rocky films, Cormac McCarthy's Border Trilogy, the London Underground and Johnny Cash.