Jimgriff,
Have you tried Ebay? I got a bunch of 1960s and 1970s issues from there - and at pretty reasonable prices.
I had read these earlier as a very impressionable teenager - they were sent to the Indian Air Force as safety magazines, and I would occassionaly catch a peek at my father's magazines. Excellent magazine - in contrast to the very rudimentary IAF safety magazine. Left me with a very favorable impression of the RAF (which even pprune hasnt succeeded in ruining!)
I cant believe the RAF stopped publishing it!