I am a little late joining this conversation, but I have only just joined RootsChat.
I adopted 2 children in Scotland in the early 70's, both as infants. The information we were given by social services on finalising the adoptions was very limited and had no reference at all to the mothers' or fathers' names. The birth certificates we/they used throughout childhood, and now as adults were the shortened version with no reference to birth parents. We also had the copies of entries in the Adopted Childrens Register - again with no mention of birth parents.
When my daughter reached 17/18 she was able to access her original birth certificate which had only her birth mother's name. I was fully supportive of this move and together we have reached many brick walls in trying to "locate" the mother - very difficult as she was a young immigrant.
Previous "chatters" are right - ONLY the adoptee can access any information regarding birth parents.
Good luck to all of you with your searches!
Carolyn