There were some marvellous flying sequences showing the Mosquitoes. All genuine stuff.
The owner of the 3 Mossie's was John Crewdson who had 'appeared' in a few films. He told me one day, on a visit to Biggin Hill with the three Mossies, that he wasn't in for the money, just the pleasure!
Sadly he was killed in Jet Ranger crash over The Wash.