Not too sure on this one ... but I do not think you can claim anything back at the moment because you are still UK tax payers until you have a work visa/permit and address in New Zealand.

Even though you know you want to settle in NZ, in your circumstances you will be just visitors at first and as such will continue to pay tax in the UK and still be able to claim benefits. That is certainly our case.

I would have thought that any tax payback will have to be applied for from NZ when you know you can stay.
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