Brianh
Sorry for the delay in replying.
"MUST" does not a rule make.
If it doesn't have head of power in the regs it doesn't mean diddly squat.
The AIP is an aeronautical INFORMATION publication, and as such a fair chunk of the scribblings in it are just that INFORMATION.
People seem to not realise that unless there is a regulation to empower the AIP statement it has no legal standing.
ie if CASA tried to take action against you for say doing night assymetrics - they could not use the AIP provisions against you as they do not have head of power - if you had an AOC they would probably trot out good ole section 28 of the act.
The point I am making is you made the statement about people breaking the law if they don't put the aerodrome name at both ends of the transmission - the reality is that if they don't they are NOT breaking the law, because there is NO LAW that says that they must do so.