Thanks for the advice NicF, I will keep that in mind, both my older boys are sporty and I know if sport is involved they will be ok....My kids go to a school with a lot of international children and also a lot of Aussie kids who have been taken out of other local schools and moved to their school and I thought it might help them settle as other kids have been in the same boat but I don't think it has made the slightest bit of difference. My youngest has settled really easily - he seems to fit in and get on with all the other kids really well. My oldest has struggled a bit to be honest. My youngest is quite sporty and my oldest isn't sporty in the slightest. The school is quite sporty and a lot of the kids at it are quite sporty as well. How well my kids have, or have not, settled seems to be far more to do with finding like minded souls than being with kids that understand what it's like to be the new kid at school.
I'd suggest choosing the school that seems to be most suited to your kids and where the other kids seem to be interested in the things your kids are interested in. They are more likely to be happy and settle easily if the are on the same wavelength as their peers, regardless of where there peers are from, or how long they have been there.