Clive Myrie presents the fourth heat of this series of the classic quiz where contenders take on the famous black chair under the glare of the spotlight and the ticking clock in an attempt to become the next Mastermind champion.

The specialist subjects are Detectorists, the ‘Alice' books of Lewis Carroll, British politics in the 1960s and Sir Elton John.

Four more contenders take to the black chair under the spotlight and the ticking clock to answer questions on their specialist subjects and general knowledge. Clive Myrie asks the questions, which are on Offa's Dyke Path, the life and works of John Cage, the wines of Portugal and Only Fools and Horses.