The last place in the final of this year's competition is at stake tonight at the Royal Military College of Science at Shrivenham. The contenders are the four highest-scoring losers from the first-round heats. Colin Driver (telephone engineer) Life and work of Thomas Arnold Colin Graham (bus driver) Ships of the Royal Navy 1900-1960 Margaret Harris (dep-head teacher) Postal history and philately of Southern Africa 1853-1960 Ella Thompson (housewife) Life of Mary Tudor