Assigned to the A&AEE - Aeroplane and Armament Experimental Establishment. Delivered to the RAF as XS770 in 1965. Painted in Regal Beagle colours for use by Prince Charles. Sold as G-HRHI in 1989. Remained in Reagle Beagle colours painted as XS770. To Boscombe Down in 2008 and used for parts to keep XS743 flying. Remains scrapped.