Stangman – Thanks. Yes I have that book but there is no actual evidence that N9990Q was a camera ship. There were some air-to-air sequences trialed near Little Rissington on 31st May 1978 but this was using Aztec G-BJDH which had a camera slung under the belly. Incidentally, the film Hanover Street had no air-to-air sequences, everything being shot from the ground.