Tonight sees the last of the first-round programmes, with four more contenders competing for the last place in this year's semi-finals.
The location is the Great Hall of the University of Nottingham.
David Milnes (solicitor) The history of Nottinghamshire 1066-1939
Vie Bonfiglio (US Air Force) The Spanish Empire in America 1492-1815
Wendy Greene (schoolteacher) The life of Prince Rupert of the Rhine 1619-1682
Roderick Moore (cartographer) Narrow gauge railways of Great Britain from 1863
