Thanks for all your feedback, menb I can really relate to what you have written. For the last 3 years, I have worried about school for kids, buying a house, extended family, cost of visits back etc and tried to balance that against the beaches, weather, out door play etc. It does get you down after a while and becomes difficult to resolve. We have also been living here year to year, so not having a longer term plan has been tough.
We are 100% going to the UK as I have now resigned from work and have arranged shipping of our stuff. We do have the option to return to oz if it doesn't work out.
I think the bit I am most concerned about is not having a job in the UK, but I am confident I'll find one within 3 - 4 months of arriving, or maybe even sooner.
Thanks again for taking the time to help me with this, appreciate it.