03/31/2009. Produced for the RAF as a 504K trainer under s/n H2518, the aircraft became surplus after WW II and was sold in 1920 to the Aircraft Disposal Company (also known as Airdisco by its telegraph address), and subsequently stored. It was registered as G-EBFB to Airdisco on January 24, 1923, when used by the Bristol Aeroplane Co. Ltd. as a flying test bed for the 100 hp Bristol Lucifer engine. The registration was cancelled on January 7, 1925.