My Mum was a McNicol - daughter of Donald, who was a son of John and Ann.
I have very little info on this side of the family. However, I have seen the letter you refer to, and my Bendigo cousins have a copy of the marriage certificate which they transcribed for me.
I did manage to send you a PM including my email address, as that seems to be better at handling attachments.
Are you connected to the McNicol family too?
Giuliana