Helmet Fire:
I would argue that Darwin is incorrect IAW the AIP, but are you sure they are not using the Military ATC publications?
There is no such thing. Military ATCs use The Manual of Air Traffic Services (MATS) and AIP just like civil controllers. MATS is a joint publication produced by Airservices and the Military.
triadic, I still think anything to do with a level (visual approach, leave control area descending) fits in the sphere of a readback. "Cleared visual approach" and "cleared ILS approach" have pretty much the same meaning, and I would expect them both to be read back as it is an ATC clearance and also a level assignment, ie, the ground.
My two cents again. I'll be broke soon!!!
NFR.