" GPfacts " the stuff is out there, Have a look on the following Facebook Pages ;
" Old New Zealand Motor Racing " - " https://www.facebook.com/groups/429302310781897/ "
and
" South Island Motorsport " - " https://www.facebook.com/groups/431588630352950/ "
Will take a bit of searching ;
I have some information in various Books and Magazines but am away from my " Den " for a couple of weeks-there will be some stuff in these, which I will look up.
From my recollection 1956/57 would have been the first season of the " Gold Star " events for New Zealand based drivers. Gold Star points were awarded in International events but only to NZ Resident Drivers.
This book published in 1963 had details going back into the 1950's on many events and the results.