hi mate
once your trade skills assessment has been passed by vetassess in melbourne they will sent you dates and venues where you can take the practical test in england, so when you go to oz you will already have your a- class licence and wont have the hassle of trying to get on the course in oz. the test is four hours long (ive been told not done it yet) and costs $1600.
hope this helps and good luck, any more questions ill try to help.