One that was not listed, in Penygraig, was converted many years ago into a Kingdom Hall of Jehovah's Witnesses for the flourishing Rhondda Congregation.
Holywell congregation, also in Wales, has (had?) a converted chapel too. Purchased in the late 80s or early 90s I believe. Amusingly, considering the pagan foundations quote, that congregation wanted to retain elements of the chapel's interior decoration but were ordered to have a suspended ceiling so that the gold Hebrew lettering of YHWH couldn't be seen. Wonder if it's still there or if they've whitewashed that wall since.
Oh, found a listing for the historic chapel Holywell congregation has: http://www.coflein.gov.uk/en/site/8168/details/tabernacle-calvinistic-methodist-chapeljehovahs-witnesses-bagillt