This is from the NZ AIP
3.1 Services Provided
3.1.1 The ATS provided are:
(a) Air Traffic Control (ATC) services, to prevent collisions and maintain
an orderly flow of traffic, to:
(i) IFR flights in Class A, C, and D airspace;
(ii) VFR flights in Class C and D airspace;
(iii) aerodrome traffic at controlled aerodromes.
(b) Area Flight Information Services (FIS), to give advice and
information useful for the safe and efficient conduct of flights.
and,
3.3.7 FIS will include the provision of available and relevant information
concerning:
(a) SIGMET;
(b) weather conditions reported or forecast, at departure, destination,
and alternative aerodromes;
Doesn't seem like this happened? AKL were advised by UNICOM NFA at 0833 of the actual conditions (3 octas at 300, 4 at 600, 8 at 1,100) and AKL did nothing about it! Well done bro!