Moving countries is a huge thing for many people and I would hope that some views on a forum that you perceive to be negative would not affect you positivity one way or the other to any extent and if it is doing then maybe you need to rethink what you are doing.....
FACTS FOR MOST PEOPLE:
moving to australia will cost a lot, you will be many years before you will be back to the financial place you are now.
you will get up every morning still and go to work (well when you have found a job anyway)
work hours are ofter longer than the uk
it will most likely be a while before you own your own house again, you'll be paying someone else's mortgage now
the weather is not 30c and sunny all year for lots of the year it is too hot or too cold to be outside
your friends and family are not here and dispute what they have said most will not visit
supermarkets are more expensive and have less choice.
Despite these and many more differences I would say that most people would not move back and are happy living here.
Where ever you live you pave your own way and make your own happiness. We have personally gone through experiences here that had you told us about beforehand we would have said we would never survive, but we have not only survived but are hugely and truly happy here.