I have what I now believe to be a transcription
only as it doesn't include addresses - very annoying
as I ordered this in the belief it would be a full certificate
but my mistake completely .
I think you are barking up the wrong tree here with your concept that you are missing out on a "full address".
None of the marriage certificates I have include what you would normally consider to be a complete postal address. From an official point of view, it's not very relevant, as it is neither the location of the event, nor is it likely to be the place where the parties might be found after the event, as most people move as soon as they are married. From the clergyman's point of view, the traditional concern is whether they are "of this parish" or not, which goes back to ensuring they have been baptised, and a precaution against bigamy.
If the marriage certificate says he was from Sydney and she was from Balgownie ( which is correct, you mentioned Balgowrie in one of the other posts ), that is probably all the clergyman wrote down.
You are much more likely to get a proper address from your mother's birth certificate, which you will have no trouble obtaining as you are her daughter.