Yes they are 240v, but the plugs are different, here is an image of what the plugs look like:
You'll be able to use your UK appliances but will need an adaptor.
I've compiled a list of other important things you need to know when moving to Australia, do check out my website (in my signature) when you have the time. Or: Travelling to Australia - The Basics - THE JUMPING KOALA
All the best and good luck with your move!