Hi All
Waiting for answers to my request to NSW State Library, and also Hawkesbury Library.
However, I am looking at a book self published in 1995, re another branch of the family. The author undertook meticulous research, that I can see, and on the subject of BMD certificates, and Church registers, this appears in his list of sources:
"Cobar, Wesleyan Church, Marriage register - marriage of Samuel William Smith and Sarah Costello (Buckley). Additional information on the register not shown on the certificate shows the groom's birthplace, parentage, and father's occupationh, plus the bride's birthplace, parentage and father's name and occupation".
So it seems that certainly in some cases, not all the information appears on BMD certificates.
Annette