Hi Tim and welcome to BE.
You don't mention which state you'll be in, and each has its own road rules.
I would say that the easiest option is for you to pass your test in UK, and as you are going to be returning there, you'll drive on an international licence in Aus. Yes, you will have certain restrictions as a new driver. I've found this info which relates to international licence holders. Hope this helps. http://www.rta.nsw.gov.au/licensing/newtonsw/international_drivers.html
If you are under 25, be prepared for a massive insurance premium.