I watched this one hunting for a few minutes, working it's way across a eucalypt trunk, checking under bark, disappearing for a few seconds at a time, till it eventually found a luckless beetle. The wasp took its time to subdue the beetle, before finally flying off with it.
Can't claim to be the first to photograph these, as will be seen when others post in the future, but we did find the likely 'boggy seepage' first. Interestingly we had four flatwing species all within about 10 metres of each other at this location, A. brookhousei, A. christine, Griseargiolestes bucki and G. eboracus