Hi Jim
So the supplementary reference refers to the 'father'.
There was an assumption that the husbands of married women were the fathers of children but in this case I would suggest he wasn't, the child was born and registered and the father, realising he wasn't the father, had his name removed from the birth entry.
The adoption is another scenario altogether.
As his certificate has been annotated, the adoption was official.
Without knowing his name after adoption, it is impossible at this stage to progress further.
The steps to take now would be to use and search the death index on Ancestry, if you have a subscription or use your local library if you don't, and do a death search with his exact date of birth. There are 214 results but you can eliminate all the women. Cross reference the deaths with births and see if you get any left overs which could be the person you seek, if they have already passed away.
Alternatively, register with the GRO's adoption contact register in the chance that he may be looking for family memebers and has acsessed his birth file so he knows who he was at birth.
https://www.gov.uk/adoption-records/the-adoption-contact-registeror here
http://www.adoptionsearchreunion.org.uk/default.htmor here
http://www.missing-you.net/categories/adoptions.phpContact Wiltshire Social Services and ask if they have an Adoption intermediary service who can try to put you in touch. The person at Wiltshire Records won't be able to help further but could see that the original birth entry had been amended to remove the name and later annotated to show the adoption.
If the circumstances of his birth caused a rift in the family it is most likely he was adopted out of the family, not by a relative.
If by some chance there is a whiff of his new name in the family, I can check the adopted childrens index to see if there is a corresponding entry. From that, you can order the adoption certificate, find out who his adoped parents were and then use the normal tracing techniques for finding him.
Hope this helps.
Dawn