Plot: The Assembly Rooms, Derby, is the location for tonight's Programme in which, for the first time on Mastermind, a husband and wife appear in direct competition. Malcolm Seymour (British Rail clerk) English theatre 1570-1620 Christine Hancock (teacher) Life and works of Rembrandt Paul Hancock (Police inspector) The life and times of William Pitt the Elder 1708-1778 Michael Lynch (lecturer) Chinese history from 1911