Three surviving THUM Flight Spitfire XIXs formed the basis of the Battle of Britain Memorial flight when they were retired in 1957 and two, PM631 and PS915, serve with the flight still. The third, PS853, was sold to the late Euan English to finance the rebuild of Hurricane LF363 (I think that was the reason) - Euan sadly died in an accident in his Harvard before getting to fly it. His Estate sold the Spitfire to Rolls Royce who own it still, though it isn't currently flying.