It was one of their new Sikorsky S 76 Cs ZK-HQC5. Unfortunately it was a rather dull grey morning and it was in the wrong direction for the sun, but I managed this desperation shot. I hoped to get a better photo of it returning but on following it on Flight Radar 24/7 it tracked inland on its return to Whangarei.
I think this was one of the very few medical emergency flights that have taken place, seemingly much less than the normal volume.
For a much better photo of ZK-HQC5 see: https://nzcivair.blogspot.com/2019/09/next-nest-s-76.html