St James's is located on Church Place, Blaengarw. It was built in 1890 to designs of Bruton & Williams, architects, of Cardiff who, 'for £1,085 found it impossible to introduce much architectural design'. The building was closed for worship in 2004.
No further details.
Sources: J.Newman, Buildings of Wales: Glamorgan (1995), p.155
http://archiver.rootsweb.ancestry.com/th/read/GLAMORGAN/2012-07/1342042510

David Leighton, RCAHMW, 28 November 2014