Hi Shopaholic this is one I can answer, yep M&S are offering free delivery to Australia at present 6th of July 2013:
country ¦ cost of delivery ¦ expected delivery time
Australia, New Zealand ¦ FREE* for a limited time¦ Approximately 10-14 days
It's funny I'm currently in the UK and you can get it delivered free to Australia yet it costs me over here!
It would cost me: £3.50 and take 3 to 5 days to get to me!