Trials support from boscombe was Hastings, which were replaced by the Brittania until sold in the early eighties. Comet XS235 was Nav and radio division trials aircraft. i recall the aerial fit for what was i think the first aircraft in europe at the time with sat comms . The nav kit onboard was to such an accuracy that equipment for new types was installes alongside and flown for accuracy calibration. i recall the kit for tornado being fitted and flown onboard in late seventies. had a few nice trips on it around uk.