Great thread....
RT procedures are not studied as such from beginning of training, I believe. Student pilots hear what their bullet-proof instructor says, and then blindly repeats it. No study of the AIP / Jepps.....
Pull out the 900 section of your Jepps and study! The RT for which airspace, when, why how and precisely what is all there.
It's always been a major issue for me when pilots decide which rules or SOPs they will choose to follow, and which they will choose to ignore. Do it right, every time and it becomes a matter of course and (that more and more illusive word!) "professional".
I had a simple but unfortunate method which I used to employ when the hints and requests to study didn't work: "If you can't use correct RT, then you won't make any radio calls." Now, when you're doing 8 sectors, no AP, in central Oz in summer, I found (some) FOs would get the point and study....