A dual time digital watch is very useful - leave one time on GMT (or NZ time on way back) and change other to current time zone (if leaving plane on way there, so you get back on time) or to destination time zone.
As others have mentioned, do declare any food you carry, so you won't be fined for bringing in fruit, veg, honey etc, which could pose a risk to NZ agriculture / apiculture etc.
NHS and NZ have reciprocal health arrangements - see
http://www.nhs.uk/NHSEngland/Health...e/NonEEAcountries/Pages/Non-EEAcountries.aspx You'll also need a travel health policy, and to declare diagnosis to insurer. Note that most polices will no cover costs of replacing lost / stolen insulin etc, so best to take care not to lose / have stolen.
For journeys longer than 28 days (check insulin patient information leaflet(s) - most say insulin can be kept out of fridge at room temp, defined as 25oC / 28oC / 30oc, for 28 days) I prefer to keep insulin in a cheap (particularly if you already own one), virtually indestructible stainless steel vacuum flask, which also offers very good temperature and physical protection to glass cartridges inside their blister packs, although you need to cut them to individual cartridges so they'll fit inside, and you can't have water in flask when passing through security, but can refill with cool water from tap once through.
When I worked in New Zealand a few years ago (a period which ended when I was diagnosed, meaning the end of my chance to continue working as a guide on seal & dolphin swimming tours) I discovered that eating too much asparagus has interesting efects on urine (it's so cheap that you can eat far more than in UK!), and enjoyed lots of types of kiwi fruit, ice cream, wines etc.
Hope you all have a great trip.
🙂