Plot: The first-round heats of Mastermind 1981 are completed tonight at the University of St Andrews as contestants from Scotland and Northern Ireland challenge for the last place in the semi-finals. Derrick McClure (university lecturer): Pre-conquest history of Mexico Rosemary Meechan (teacher): Life of Robert the Bruce James Murray (teacher): Life and career of General de Gaulle David Stevenson (employee relations manager): Battle of the Somme