All the aircraft that flew in the film were replicas built by Personal Plane Services at White Waltham/Booker, The Hampshire Aeroplane Club at Southampton, Hants and Sussex Aviation at Portsmouth, or Miles at Shoreham. Can't think of any other companies involved.
Shuttleworth's Blackburn Monoplane certainly appeared in the film but didn't fly.
Pilots included Derek Piggott, Tim Clutterbuck, Joan Hughes, Peter Hillwood, David Watson and Allen Wheeler.
Might watch it again later, mmmm, Irina Demick...
Edit: Tim Clutterbuck may have been the crop duster, looks like he flew helicopters for Autair.