Hi there, it is hard with teenagers, they have their comfort zone & when this is challenged they wont go for anything new in life a lot of the time, it is especially challenged when you move country, they need time to adjust, and a few mths is nothing when you add up how many yrs they lived in the UK and the roots they had, give them time & encouragement, sometimes after a year or 2 a trip bk home makes them realize the life they have in OZ is much better, but id try not to let them go bk before that as by then they have changed a lot & their mates have all moved on in life. As you know I have the same prob this end, my eldest loved OZ the most out of us all and now has a BF and seems reluctant to come bk to OZ now! but Im not pressuring her, Im calling her bluff at the mo by saying we are going anyhow, and if she wants to continue living with us, it`l be where we choose to live-not wher she chooses us to live!
Id be patient and try encouraging them give it a full go, just be aware it is scary for them you know, starting from scratch with new mates etc!
Wishing you loads of luck, it`l all be ok, may not feel like it at the mo, but give it time.