Incidental to all this, does anyone know to what degree, in financial or just operational terms, the cost of developing the Smiths system was amortised (or hidden) by the lengthy work done at RAE Bedford with the RAF's Short Belfast, XR364? As I recall, the aircraft did about 4 years or so up there before finally reaching 53 Squadron at Brize Norton - and the great irony was that the RAF never got an autoland capability from it at all.