Dear Nancy in "shaky" Christchurch...sounds as though you've found a couple I'd been looking, off and on, for about 8 years! This is indeed my Great, great uncle & aunt. They got married in 1859 and then just disappeared off the face of the earth so to speak...had tried the US and Australia, but could never really get to grips with where they might have gone.
Anyway, I'd love to get a proper chat with you. You can get me at firstname.lastname@example.org