These days the rank held and recorded on documents, 1250/F90 etc is MACR, Master Aircrew. It has become the generic rank, Master Pilot, Nav, Eng, Sig, AEOp and ALM were all titles that have all now been consigned to history with the advent of the Weapon Systems Officer/Operator and a common Brevet. It has to be said that even though our IDs said MACR most of us still used the titles according to our trade long past the advent of the single Brevet.
As for Taff he was truly a legend and I was lucky enough to both know him and take part in his retirement flypast at Odiham, photos of which having been posted here before.