Hi Jimmy,
In this video there is a small segment of the storm (near Gerringong?) This would have been taken shortly after the possible tornado I believe. Looks to me to have HP structure at that stage (both visually and on radar).
http://www.youtube.com/user/pingtang666?feature=mhee#p/u/17/zuYywXcLEh0
Also, I found this when digging through the old weatherzone thread -
http://members.ozemail.com.au/~patricktobin/wx/thunder/
Excellent sequence of photos there from Canberra.