Hi Susie,
The Glamorgan Family History Society doesn't have M.I.''s for St Catwgs ,Cadoxton.
But you can contact the church warden a lady called Annette Williams on 01639 770972.
She is very helpful. While I was researching my family at the church she looked up all the records that I required, some going back to 1785. Then and here's the good part whilst I was photographing the documents she went out and found the graves for me and then took me to each one . The church asks for a small donation in return but for such help I couldn't be more pleased to contribute to . I cannot give you her e-mail because the Roots chat rules don't allow it but I bet you can find it from the church website. Its a very large churchyard by the way as parts of the church date back to the 1300's
Regards
Mike
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