Susie ,
The Glamorgan Family History Society sell booklets which cover Parish Records of individual churches.
The list Baptisms, Marriages and Burials or Deaths. The also produce booklets on Monumental
inscriptions. Most reference libraries , county archives have many of them on their shelves so you can look for what you require. Also you can log on to GFHS website (use the initials ) and you can order them by post. There isn't one for the monumental inscriptions of St CATWGS in Cadoxton. But here is what they have ;-
Cadoxton Juxta Neath St Catwgs
Baptisms 1721 to 1899,Burials 1721-1889,Marriages 1721 to 1837.
These booklets list all the entries that the history society members have found in the Parish Records
What part of South Wales are you from ? Maybe I can tell you which library has copies
Regards
Mike