There were Gibbards on South Island from about 1850, in business etc, that came from Oxfordshire, Berkshire area of England. This could be one of them. I'm following up on a step-sister of Charles Gibbard following him out to New Zealand.
I have discovered that William, a son of Charles, was in fact married to Delicia Russell ? and they had children. So more to follow up in the BMD records I guess. In order to get at electoral rolls for NZ I have to pay a substantial premium to Ancestry over my existing subscription, so I guess I will leave that until our depression here blows over (sometime in 2125 apparently!)
Thanks again for your help it is much appreciated.