Hello Graham from Down Under.
I'm about to head to bed after another late night of research. I'll ask a moderator to move this thread to the NZ board, where we will be able to assist you. I have a busy day ahead later, so some of the other NZ board contributor's will assist sooner than I will be able to.
Alan
PS While I'm sleeping you can start with our National Archives ARCHWAY research, plenty of Kerr's there. Auckland War Memorial Museum CENOTAPH, and our PAPERSPAST web pages.