Don't forget that AUD 40 is almost 20 quid. The Aussie tax bands are higher than the UK and don't forget the Medicare levy or your own medical insurance which isn't cheap.
To take home the big money you will be away on a camp for most of the month.
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You can't compare going to work overseas with work in the UK. It's like going on holiday and having the wife ask you "how much is that in pounds" every 5 minutes.
You need to go with an open mind you can always come home.
I have seen people go to the Gulf, bank everything and get out quick with a nice few quid and I have seen them go there, have 5 servants, dine out every night and live like a lord and leave skint and in debt!