From the AIP:
Fuel:
Air BP Avgas 100, Swipecard
Mobil Jet A1 available on request to Kaikoura Helicopters, Tel (03) 319 6609. (Not located on Kaikoura aerodrome)
Morally this pilot should not be prosecuted, of course. I think that slapping him right and left (a verbal warning!) would be sufficient.