Another Boscombe AD dit relevant to this thread.
Shortly after the J Herc arrived at Boscombe a Para drop was planned to try out the aircraft's nav computer ability to compute a CARP.
After a number of passes over the DZ with no jump lights appearing the Paras were getting restless and wanted to know why they couldn't jump. The reply from the front end was "you know we're over the DZ, we know we're over the DZ, the trouble is the aircraft thinks its over Swindon."