Hi Caryn,
Two Posts in one

May I ask for your response please
.....Oh Caryn ... that is a tad disappointing ... you mentioned National Archives but the link is to the National Library of Australia... Two very different organisations ...... PS Have you checked the websites for the National Archives of Australia? OR Archway New Zealand?
Secondly,

Hi Muss
Yes thank you - I have this article.
Cheers
Caryn
The cutting that Muss posted gives you the information that the Wesleyan register for Baptisms, marriages and deaths at Waitkouaiti, was held by the Rev T N Griffin in 31 March 1898. Thus it seems to me that it would be worthwhile for you to make NZ enquiries as to whether that very register is extant, and more importantly if it had at some stage been fully transcribed.
Perhaps it will contain details for Thomas George TANDY's baptism, or his older half-sister's baptism, or for Bertha Gorham's step siblings, or Bertha's marriage to Thomas Tandy.
I note that the newspaper cutting is from Otago Witness , Issue 2300, 31 March 1898, Page 26
and indicates that the second entry in the register was for the baptism of Elizabeth Grace, daughter of George and Harriet Glover, labourer, and was conducted by the Missionary, James Watkin, on October 11, 1840.
Caryn, have you considered seeking assistance from the fantastic NZ helpers at RChat ..... Perhaps they may be able to find a connection between the George Tandy who was aged 44 and Bertha's first husband, or perhaps they may be able to find Bertha Gorham's son, Thomas George Tandy.
http://www.rootschat.com/forum/index.php/board,299.0.htmlCheers, JM