I made dh promise before we got married that we would not live in England forever ( he is english, I am an aussie) I also told him I definitely would not raise my children in the UK - in spite of living in a fab village, renting a great place and loving our life there.
We moved here last June and have not looked back. ALong with all the things others have mentioned.. our dd1 has sn and the resources and services we can access her are far superior to anything we had access to in the UK ( obviously that depended where you lived). We are able to have a fab family home on ONE wage and still have a good quality of and standard of living. To do that and remain where we were in the UK - huge mortgage, two incomes and the stress of all of that....
I moved to the UK in 2000 and knew NO ONE!! I did have a job to go to but that was it.... in four years - met dh, had dd1, dd2 was on the way and made some fab friends. In both cases - moving to the UK and back to Aus - the things I missed were family and friends - other than that - everything else was fine. I did have friends come and visit me and since we have been back - two lots of friends have come and visited. Hoping to get dh's family out soon.
YOu will be homesick, you will miss people, you will have tough times...... but that is no different to if you stayed.
I would look at it as a positive experience for your family and your children - how amazing to say they have lived on the other side of the world and experienced what it is like to live in Aus - and there are some very big differences even though you might not think it... have to ask SW or someone else about that.
From dh's pov - gave up a fab job and moved away from his family and all he had known... he has no intention of ever going back - will go to see family and friends but loves being here so much - he just can't imagine ever living in the Uk again. He does however feel weird having Christmas in summer
Sorry - but houses and cars can go in a flash... think of circumstances where people have lost everything - they can still be there when you get back or something even better.... the village school will still be there. But will you ever have this opportunity again. If you give it a go and it doesn't work out - what have you lost in real terms... but if you never do it - will you and dh spend the rest of your lives playing - we could've done this....
I now have 2 dds under four and we have the best time - there is such a better outdoor lifestyle - beach, parks, pool, visiting friends, zoo and so on.
Sorry just realised I am rambling.