CM, Peuce is correct. In the case of AV there IS radar surveillance. If there IS surveillance then E or E+ is a lower standard of service than what is required for a busy aerodrome that should be class C.
Broome and Karratha where changed from E to E+ to facilitate DTI...(What a very old concept!)out of a non-surveillance tower. OAR, rightly, changed this airspace to D over D to enable positive control from the tower...which now places us at a busier metropolitan aerodrome. The procedures are screwed up and as Peuce points out a change of a word and we got D airspace...go figure!
I think the director should butt out and let OAR actually do what they have been directed to do..design airspace APPROPRIATE for the conditions and facilities. AV C over D, or, D over D as a minimum but should really be C all round!