Gary, I know of a Frederick William Peters with an Inglewood connection. To let me know that we are dealing with the same person can you give me his wife's full name and marriage date please.
I am a researcher and know about German Ancestry in NZ as my relatives were German Poles - any Germanics had to register as aliens by 1911 otherwise they would have been interned during the WWI. Look for The Register for Alien Registration.
Even David Lange's relatives are in the register. If they are in the index you can get a copy of the registration papers from National Archives for a fee.
Spelling may be different to what you presently use as it may have been anglicised a few times.