believe its documented as prop tips being cropped as it couldnt operate from Andover which was southern comms sqn base , think they had to relocate because of this , sure someone has the full story. Regarding XS743 i worked on her during my time at boscombe when we had the regal beagle as well xs770 and xs765 for comms work . XS743 was a pre production aircraft so amazing it survived. the analogue controls for the right seat were designed and installed by Cranfield.