Noteworthy that in the BOAC Britannia 102 sequence G-ANBA to 'BO there is no 'BG registered. Internet research shows photo evidence of 'BG in BOAC colours but the aircraft was later re-registered as G-APLL. Some sources suggest the change was demanded by superstitious pilots who were not keen to fly an aircraft whose reggie was an acronym for 'No Bloody Good'. Unable to establish whether this is merely an aviation myth.