Just so that we are clear I’m not afraid of kickin’ my own moronic ass sometimes.
Turns out it is Physignathus lesueurii lesueuri, an Eastern Waterdragon. If I’d paid any attention, I should have noticed the complete absence of beard.
I saw this little fella, and a few more (and a massive goanna, coming up) along Lane Cove River, in the Lane Cove National Park in North Ryde/Macquarie Park.
Thank you Jen 64 for pointing out my error. More on identifying subspecies of waterdragon over at Australian National Botanic Gardens website – note the face stripe goes eye-to-ear in this critter, distinguishing it from the Gippsland sub-species, you can also see some of the red underbelly if you look hard (plus it was taken in Sydney, not Gippsland)