Hi Davecr.
I'm a french ACC controller at Paris ACC and your post is interesting : some of us in my team recently asked about this expression because we had opposite views of the use of it... But finally after a check in the icao rules none of us was right ! For sure i must admit it's something we never learned and finally all trainees use it in the same way the fully qualified controlers do.
That's true in your example the controller should have said:
" G-XXX , break break , AF 356 direct...."
and then "G -XXX, good day,pass your message".
In fact we never say G-XXX before break break BUT in most cases we remember who called us and we don't ask "station calling ?" , we say "G-XXX pass your message".
But finally you're right and I try to explain to other how to use this expression correctly...