I've got a database full of New Zealand Bank Codes, but no idea where they came from. So I can look up 02xxxx and identify that it's BNZ and some branch. I've found that this website (which doesn't by any means look official) has a list, but I have no idea how old it is / correct.
I see that there is an official Australian body that maintains both downloadable full lists, and updates. Does anyone have any idea how to obtain the latest list for New Zealand?