Please see
http://www.nppl.uk.com/documents/NPPLXCREV061_000.pdf :
JAR-FCL PPL (A) or UK PPL (A) to NPPL (SEP)
The holder of a JAR-FCL PPL(A) or UK PPL (A) with SEP class ratings who wishes to obtain a NPPL (SEP) shall:
a. Produce the JAR-FCL PPL (A) or UK PPL (A), which includes evidence of validity;
b. Hold a valid NPPL Medical Declaration or JAR-FCL Class 1 or 2 medical certificate.
It should be noted that any additional ratings attached to the JAR-FCL PPL (A) or UK PPL (A), such as the Night qualification or rating, IMC or FI rating are not transferable to a NPPL and the holder’s privileges will be restricted accordingly.
So - just comply with the requirements as above and send the form
http://www.nppl.uk.com/documents/NPP...sion14_000.pdf off to NPLG Ltd, together with the relevant payment.
But you won't be able to use your NPPL in New Zealand, unless the NZ CAA gives you permission.