Make sure you do the UK medical and the check ride with a UK examiner to renew your UK certificate of experience. You will be getting the Australian licence on the back of that following medical,air law and probably some training followed by the GFT/check flight. Australia has lots of rules that differ from the UK and budget on several hours with an Ozzie instructor.
I don't know if things have changed now but when I first arrived in Australia (back in the 90's) I brought with me an N reg aircraft which I was allowed to fly everywhere on my US licence. I criss crossed the outback for a year seeing some amazing remote places.
However when it went on to the VH reg I then had to do all the cross country flying and demonstrate remote area awareness before the local restriction was lifted on my Australian ticket.
