Given the location John I was thinking another possibility is Highlands Copperhead (perhaps shedding as well) . I hadnt realised that RBB snakes can get that light brown colour when shedding. I guess it is down to three possibilities - RBBS, Tiger Snake (head not the right shape?) or Highlands Copper head. Body shape not right (too stocky?) for Eastern Brown Snake. I wonder if the photographer has another photograph they can send us or add.
All of the above worried me too. I think the misleading colour could be a result of light tricks given the skin is starting to lift. If I saw only the head I would have had to say RBB but I agree, if the photographer has other images, please submit them, especially if of different angles. None of the other likely suspects really fit even with the odd dorsal colour here. In the absence of other images I am still inclined to RBB.
Re your question "How do I add 2 more images as requested by moderators - it wasn't obvious on the edit page (no button)": After clicking on Edit, slide the images from your desktop into the upper rectangle.
I reckon this is a Highlands Copperhead (Austrelaps ramsayi). Reasons being, the relatively small head is distinctly different in colour to the body colouration i.e slatey-grey head distinct from brown dorsum, separated by a yellowish collar, which you won't find in Pseudechis porphyriacus. The yellow flanks visible in the photo is also a distinguishing feature of A. ramsayi, along with indications of black edging to the pale yellow lateral scales. Whereas, RBB's never have pale yellow flanks. I can only count about 15 mid-body scale rows, which is the usual number for Copperheads, as opposed to 17 for Red-bellies.
Whereabouts is the location given, as Willo mentions "given the locality" but I can't see it anywhere?