Many small and some medium-sized birds sounding out alarm calls and darting about usually means only one thing - Currawong. So, as I grabbed my camera and approached the tree that seemed to be the epicentre of the commotion, I fully expected a Currawong to fly away, pursued by small birds. In truth I couldn't see much at all to begin with then, when I located a largish bird silhouette, it was hard to tell what it was - even through the zoom lens. I took some snaps, walked forward a few paces and took some more. Here is the happy result, photos of what I believe is either a Brown Goshawk or a Collared Sparrowhawk, tending toward the latter due to the yellowish patch behind bill and (apparent) lack of dominant 'eyebrow'.
Top left a Grey Fantail is brave enough to get within range - the raptor looks like it might be considering its potential as a snack.