- fuel (avgas) in NZ? Australian carnets, credit card, cash? No. Prob going to have to buy off someone locally, which could be tricky
- PPR/notice for airport parking (not NZAA - Ardmore) Ardmore you shoudl find somewhere. Recommend leaving AA
- arrival immigration to Queenstown - is notice required? Yes
- departure immigration from NZ - where is it possible? Several places with notice and $ but best to stick to with main ports to avoid hassle.
- the spray cans of insecticide - I've read that NZ quarrantine will hand them in the window - is that a problem if you need to open the door to achieve this? Won't be a problem but you could just get your own can of TOD and spray it before you arrive and give them the empty can
- if a diversion to Invercargil is required, will that be an immigration problem? Most likely
- where to stop-off in NZ whilst heading north? As others above said, definitely go up the west coast, over to Nelson, over to Omaka on your way up. Scenery becomes less interesting the further north you head...
- fuel in Norfolk and Lord Howe - any issues? Assuming avgas, phone ahead make sure there is some for you
- where to find wind forecasts for the mid-flight levels for the southen route? Handler would sort you out
I would highly recommend a handler like Rob Leach - Air Center One in Auckland (they will also look after you in Queenstown) that will cover all your customs immigration maf, planning, weather, fuel, parking, random questions and advice. Well worth it. Rob is a great guy and the service is probably not as expensive as you might think.
Enjoy your trip !