I also agree with Bevdeforges. If you've seen any of the "Get a new life" programs you'll have seen that people who have problems where they are living often take those problems with them.
We've found that people that we've met often have one or two jobs, especially if they are trying to buy a house. There is crime over here too and the deaths on the road of young adults is particularly worrying.
That said we moved here for the weather (my husband has circulation problems) and to get out of the rat race. My husband was driving 2 hours each way to and from work and now he walks to work!
My home based business is online so I can go anyway and still have access to my business.
I'm too much of a control freak to move out to Australia without having been here first
. I have close friends who have been to various parts of Australia and have decided it's not for them whereas we love where we are (Mount Gambier in South Australia).
Also think about the effect on your family of being so far from the rest of your family (if you are close). I've heard of mothers feeling guilty that their children rarely get to see their grandparents. Flights aren't that cheap from Australia to the UK (or anywhere for that matter) and it's cost about $1700 + for one adult return to the UK. Just another to bear in mind.....
Hope that helps....
Karen