Also, wondering why you would want to renew your Oz PPL in the UK - if you're not flying in Australia, it's just a waste of the countdown time till your next BFR. As stated, just do your BFR once you are back in Oz. If you want to study up on Australian procedures, there are plenty of online resources provided by airservices, do some home sim practice with XPlane using Oz airfields, listen to Oz ATC with LiveATC dot net.