Interestingly there was an article in a recent Oz where the guy who used to work for CAsA and wrote the rules re CAGROs...NOW admits that he was wrong to limit the job to just retired ex ATC folk, and as in the US it should be used.
Rocket science it aint !!..its just an 'advisory' and pilots will use it as they will
Since it is something done, useful and deemed a safety enhancement in the US of A...for goodness sake why not here.?
As for for Houston's trite comment ' we want our firies to respond, not be on the radio' .... does it really make any difference if the firies are drying hoses, servicing the truck, playing volley ball or cards ...or monitoring a radio...because in the event of a call out they drop whatever they are doing and bolt for it.
This issue demonstrates that hidebound bureaucazy rules, the control freaks
will continue to call the shots because they think they know better and as usual enhanced safety comes a poor last