WK800 made her last flight as a D.16 on 11 October, 2004. In her early life, she joined the RAAF’s 77 Squadron as A77-876. On return from the Korean War ‘876’ was converted to U.21 drone by Fairey Aviation at Bankstown, NSW, Australia.
In 1971 A77-876 returned to the UK taking up her former RAF identiy as WK800. Following equipment changes the U.21 was redesignated D.16 and used to train Jindivik controllers and for calibration flights.