TomJoad,
The reference to TG21 (General Duties) was something that was always rumoured throughout my 30 years. That aircrew were mustered into TG 21 ( General Duties) as were the staff in the guardroom. If I spent 30 years in ignorance of the real facts, I apologise to any aircrew mates who might read this thread. But I like the principle.
Smudge