Double Formula 1 World Champion Graham Hill's Elstree-based Turbo Aztec D. Tragically, he and five members of the Embassy-Hill Racing Team were killed when the aeroplane crashed 3 miles short of Elstree on 29 November 1975 making a night approach into thick fog. It subsequently transpired the aircraft was legally unregistered at the time having been cancelled from the US register in August 1974.