I don't have first-hand experience with importing a mini to NZ, but I'm aware of a scheme called Special Interest Vehicles which might allow you to import a classic mini without having to meet crash safety standards, emissions standards etc. And it is definitely possible to import minis, because dealers have been bringing them in from Japan recently. Whether or not they use the Special Interest Vehicle scheme I'm not sure though. You can find out more about that here: http://www.nzta.govt...t-vehicles.html
Another thing, I believe the regulations become more relaxed if you've owned the car in the UK for more than a year, it would be worth looking in to this on the NZTA (New Zealand Transport Association) website.
Also I just noticed you're in Portsmouth at the moment. Funny that, because I moved from Portsmouth to New Zealand with my family in 2004!
Edited by W1NG3D, 15 January 2015 - 05:23 AM.