Just found this on child trust fund website
Q. What happens to the CTF account when children move away from the UK? Will a child lose the CTF account if they leave the UK?
A. The account will remain open and family and friends will be able to continue saving in the account. It is possible to make payments into CTF accounts from abroad. No further Government contributions will be made while the child is away from the UK (e.g. at age 7).
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Q. If a child returns to the UK after their 7th birthday will they get the age 7 payment?
A. The child needs to be living in the UK on their 7th birthday to get this payment. They will not get it if they move to, or return to, the UK after their 7th birthday.