Today's contenders are:
Michael Macdonald-Cooper on the Jacobite rising of 1745; Struan Case Robertson on Allenby and the Palestine campaigns 1914-18; lain Bradley on the life and times of Erskine Childers 1870-1922; and Michael Chilton on Russian orchestral music 1840-1943.
Magnus Magnusson interrogates them on their specialised subjects and general knowledge from the University of St Andrews, Fife.