Andrew that simply isn't true. Yes is possible to see one from our latitude - and yes, you'll have to go as far as Hargraves to stand much chance of a good view.
I've seen - and photographed - a good one from Mt Banks (north across the Grose valley) on Bells Line of Rd in October 1989, which at that time was about as good for observing as Hargraves is now. Andrew James has one of the images online here
http://www.southastrodel.com/PageAurora001.htm. This was taken from the upper carpark nearest the main road, facing south - the lights are across the valley in Blackheath/Medlow Bath.
This was a 10 second exposure on Ektachrome slide film pushed to around ISO800, using a 17mm rectilinear wide-angle lens at f/3.5 (the field of view is 100 degrees diagonally). It was so bright it drowned out all but the brightest stars and you could have read a newspaper headline by it; the brightest object in that frame is Jupiter, in the western sky. The aurora started from the south and came over in huge waves, each lasting 5 minutes, then a gap of 20 minutes or so till the next.
It was also kind of eerie, sitting there on a warm, dead calm evening with not a sound, and having this going on overhead.
Since then I've also seen a few reddish discharges along the southern horizon though they didn't come overhead. From someone I know at the BOM, apparently these often result in country farmers calling the bush fire brigade to report a distant (non-existent) bushfire.