I too decided to go back ( am Irish so not technically a pom in Oz although my best mate is a pom and we always head to English pubs , hit the pale ales and watch the soccer).
I have been here 10 years now. Started on a working holiday visa and worked my up to citizenship, getting it May and leaving in June Ping Pong Paddy!
I have a good job and history here but last Christmas on holiday with my brother, who is based on London, I just decided I wanted to go back to Ireland/England.
Total emotional decision and felt the time was right.
I was with an Australian girl for 5 of the 10 years and was immersed in the Australian culture and "way" of doing things. So it's fair to say I was part of the Australian lifestyle.
I hope I'll look back with no regrets. The work life,expensive lifestyle and lack of holiday destinations is getting to me a lot. The way I see it If I get a job in Ireland( which I should eventually ), I can buy a house cheaply in area where all my family are based. That's the game changer for me!
I will be taking 2 sun holidays a year when I get back to Ireland though.