Do a search of utube there are some films of a Rover SD1 ( cringe) with a merlin or Meteor ( the tank equivelent in it running...........
As for the car, try contacting the Rolls Royce Heritage trust at Derby or one of the other bases
see
http://www.rolls-royce.com/history/h...ices/derby.jsp
other possibility would be
http://members.lycos.co.uk/pwgrieve/