One place the CAA want feedback is on the forum at
www.flyontrack.co.uk
It's quite an interesting site and the discussions about airspace busts are worth reading. There's a lot of discussion about the Oz guides and how good they are.
I have just started flying down here in the empty Southwest and having looked at that website (and the 1/2 mil map), I'm now rather terrified of venturing upcountry!
QDM