Cadets were not supposed to flash camera's around on the flight line, so I didn't get many pictures. However, this FR10 did cross my lens at one point.....
The serial appears to be XE651. When I flew it on 1(F)Sqn at West Raynham, this was an FGA9. It's difficult to see the nose detail on your shot, but I suspect it was still a Mk9 - can't see why there would have been a Mk9 to Mk10 conversion as late as 1969. Also, the UK Military Serials website lists XE651 as an FGA9 and has a 1973 photo in 58 Sqn colours at Wittering.