English: Folland Gnat T Mk1 (XS102 in RAF service, now called XR991/G-MOUR) during a display at Kemble Air Day on 15th June 2008 at Kemble Airport, Gloucestershire, England. Built 1964 for the RAF as XS102, put on the civil register in 1990. This aircraft, kept at Kemble, is painted in the colours of a former RAF display team who used Gnats - the Yellowjacks. The reason for the change of military serial is that XS102 never flew with the Yellowjacks, but XR991 did.