Oh, thanks for that. I had been using another app (UAV forecast) with 5.5km exclusion zones around airports and 1.6km around heliports. While the app may have calculated this accurately, I think it failed to take into account the extended no fly zones for approach and departure paths!
From the CASA app it looks like there are small slivers of land where flight is permitted (45m max) at La Perouse (one is near Cruwee cove, one of my favourite locations!), and in Malabar, but these are very small and wouldn't really satisfy my urge to drone.
What are your favourite places to fly, BlakPhoenix, and others?