Good luck with everything! I'm in a similar situation to you, I'm an Aussie, DH is Scottish. We lived in Adelaide for 10 years, and just moved back to Scotland 2 just over 2 months ago. So far we don't regret a thing!
We have 6 kids, 11, 10, 8, 7, 5 and 4, and they LOVE it here. We're on a farm in the highlands, so they have heaps of room to run about outside (something we didn't have in the suburbs of Adelaide). They have all made new friends really easily at school, and DH's famiily are much nicer and closer than mine, so the kids now have aunties/uncles/cousins/etc. that they get along with really well.
Anyway, it looks like you've already made your decision to move over, so i just wanted to wish you all the best, and i hope you all love it here as much as we do