Ah, the added complexity of local training callsigns. Manby/Strubby used J (JP) and V (Varsity) followed by the instructor/student 2-digit personal callsign. If going 'elsewhere' they would use the station trigraph, followed by that number. I guess the SpecN/StaffN Canberras [and later Dominies] used C/D if doing local training, but generally they were going 'away' and would thus use the trigraph!
So ... you used the FIRST letter of the trigraph when 'away'? ... and the LAST when playing at home? Ignoring local peculiarities, I may therefore have been correct in post #12 after all [exempt local flying training activity].
Gawd, what a complex shambles!!
