Monmouth workhouse, prior thread & recommended site (General)
This prior thread should hopefully help.
http://www.forest-of-dean.net/fodmembers/index.php?mode=thread&id=45502
One of that thread's search engine hits says "After 1930, the former workhouse was renamed the Ty'Bryn Public Assistance Institution, then from 1940s became Monmouth County Infirmary."