Plot: Four contestants from the North of England take up the challenge in the sixth heat of Mastermind 1981 at the University of Bradford. Hutton Barton (probation officer): Battle-cruisers and battleships 1906-1966 Mary Ann Ebert (civil servant): French wars of religion 1550-1588 Marion Mayers (housewife): James Graham , 1st Marquis of Montrose John Watt (lecturer in computing): History of Kenya from 1895