Just spotted a 'Spulling Mistook' above. Meant to ask "PAS" crews about the CC's. If PA crews want to offer the difference with their lot it would help as well.
Have just had a look at the following thread on Rotorheads:
http://www.pprune.org/forums/showthread.php?t=283273
Follow thr link and take a look; It looks like the Ozzies have an 'across the board' system similar to what I was getting at. And it allows for flexibilty!
How transparent would that be??