I'm currently looking at all this also, I'm from Bolton and due to the big difference in cost for rent or buying property in Oz, health cover which is looking quite dear, the cost of things in shops, and cost of a night out, I have used 2.5. Can rent a nice 3 bed house in outskirts of Bolton for £600 month, this for instance needs x2.5 to even start getting close to rent for a month for same type of house in outskirts of Brisbane, upwards of $1600 at least. I've noted everything down and hoping to clear at least $6k instead of £2.5k back at home.