Hi
This may not be any help, but...my great grandparents lived in Swan Square. It was opposite High Street, next to the Baptist Church, in what is now Abersychan...I can vaguely remember it, but it was demolished late 60's early 70's. I don't remember ever hearing Nightingale being referred to, but I will ask around (still got family in the area) and get back to you.
Regards
Julie
