Just wanted to thank everyone for their suggestions and wish to report that my visit to Christchurch Library unearthed some wonderful answers - spent 3 days there and then the earthquake happened so could not go back for more info. I don't know if those amazing records have survived or not! Returned to Australia and visited Melbourne and was able to spend time and take lots of photos of the church where George and Mary Ann were married in 1853. Even viewed the register - but was told that if they had married a year later, it was necessary to show the names of parents as well which would have been a bonus! Can't win 'em all! At least I now know where they are buried in Christchurch, and how many children and grandchildren they had. Thank you again- am so appreciative of the help given.
Regards
Kina