Hi Wendy,
Thank you for replying and giving me some information I didn't have! We know very little about the Wiggins/Whitnall branch of the family. My gr grandmother was Charlotte Jane Wiggins, b. 1881 in Waitahuna. She was one of ten children. We know of some but not all of them. I will make a list and send it to you if you wish, although they are Wiggins' connections rather than Whitnall.
The following are the death certificate records for Jane Wiggins (Whitnall) and husband John. I am presuming they came to Australia with some of their children.

3055/1891 WIGGINS JOHN JOHN JEANNIE BALMAIN
23084/1945 WIGGINS JANE HENRY CHARLOTTE BALMAIN

I look forward to hearing more about the Whitnall family if you don't mind sharing your research with a distant cousin!
Please contact me through my own email address if you wish.
regards

Jen