Steve, I've got some info from Transport SA from a mate who work there.
Here are their approved chartered professional engineers.....you might probably know it aldready
1. Tonkin Consulting
2. Australian Technology pty ltd (Regency is a little bit iffy about this guy though...i think u know that toooo)
3. Rory Thompson Services
4. Forensic Engineering and Associates
5. Engineering analysis & software
Now not all of them are catered for our purposes. PM me ur fax no and I see if I can fax this to you if you want a copy.