DT14207 - New Zealand: Relief from New Zealand tax
You should check the other guidance available on GOV.UK from HMRC as Brexit updates to those pages are being prioritised before manuals.
No special forms are available in this country for the purpose of claiming relief from New Zealand tax under the agreement. Anyone wishing to make a claim should write to the Inland Revenue Department, Inland Revenue Building, PO Box 2198, Wellington, New Zealand.
A residence certificate (see INTM162030) will be required in support of the claim.