Hi Steven -Sorry for the delay in getting back to you. I have had a visitor from the Uk staying with me so we have been out and about exploring for the past week.
The situation when going to New Zealand is not quite the same as when going to Australia as New Zealand and the UK have a social security agreement whereas the UK does not have an agreement with Australia. I'm not exactly sure what this means in practice, but I think that if you receive a UK pension, your New Zealand pension will be reduced by the amount you receive in the UK, basically making the receipt of a UK pension pointless. I would suggest you contact the NZ superannuation department to ask if you can receive both pensions before deciding to pay additional NI contributions to the UK. Here are their contact details http://bit.ly/6rwp7E If you find that you can receive a pension from both countries, can I suggest you complete a free staet pension assessment which you can find on my website here I can then tell you what action you need to take before leaving the UK to qualify for the cheap contribution rate.