Believe it may have been HRH Prince Harry in the back of the Mustang. One of the T9s went tech and he gave up his seat in the two-seat Spit to allow a veteran to fly. Good man.
Am guessing they wheeled out the Mustang to get him flying. Certainly looked like him in the back (bonedome on). It was the final departure, just after the last of the BoB fighters.