Sorry, Dazz, I'm about to be away from the computer for a week but someone will help. If not I'll check for you when I get back.
One thing, though. There were several Humphrey Callisters on Familysearch. Are you certain from shipping records and civil registration that the birth year you gave is correct? If not 100% certain you need to get the NZ certs and passenger records first, because otherwise you could waste your time following the wrong person.
Sue