My final words on this subject. I have just read 166-01 and the wording is variously, require, must and should. My understanding of require or required is the same as must, as for instance if I am flying into Archerfield and say “Request runway 28R” the controller can deny that. However, if I say “Require runway 28R” then that is what I get, no argument. I agree that it gets a bit foggy when it is ‘required where the possibility of collision exists’ I am not sure how one can define that. In so much as, if no one gives a call then the possibility of collision must exist unless you can be 100% sure of seeing any other aircraft, I know I am not. I shall continue to give only the recommended calls, no more, no less, unless I do have to respond to another aircraft. Just a last question, I fly GA with a PPL and had to do a radiotelephony test many years ago. Is this still a requirement for RAAus or for that matter PPL?