"Banwen is a small village in Neath Port Talbot county borough ... Banwen is part of the community of Onllwyn along with the village of Onllwyn itself and the adjacent parish of Dyffryn Cellwen" wikipedia
The church is dedicated to St. David, is in the Benefice of Seven Sisters, and diocese of Llandaff. Details of the present incumbent of this benefice can be found at the Church in Wales website. The church can be located at grid reference SN855098.
George Ewart Evans Coalfield Study (audio recordings 1960-1979 "George Ewart Evans was one of Britain's foremost oral historians, the majority of his work being focused on East Anglia. This collection of recordings by George Ewart Evans studies the South Wales Coalfield, with emphasis on the areas surrounding Banwen and Onllwyn"