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Plastered walls and small high clerestory windows over 4-bay arcades of plain chamfered pointed arches on ashlar alternate octagonal and round columns, a thicker ashlar pier between first and second arches on S, relating to S aisle crosswall to SW baptistery. Steep open nave roof with thin scissor-trusses on small hammer beams on wall-posts carried down to small carved corbels. W end has Gothic timber dado panelling. Aisles have lean-to roofs with diagonal braces from carved corbels on arcade walls. S aisle has pointed arch at W end to baptistery, organ at E end. N aisle E end has pointed arched door into vestry. Pointed chancel arch and 2 steps to chancel with similar roof. Chamfered tall pointed arch to S to organ, pointed door to N vestry. Two steps before vestry door, one step to sanctuary which has encaustic tiles.
Fittings: Ornate marble font, pulpit and reredos apparently of c1870-80 in lavish coloured marbles. Font has veined marble octagonal bowl, the principal faces ornamented with carved quatrefoils in roundels and four marble spheres in corners. Marble fat column below with 4 small marble columns around. Pulpit is large and square, in veined marble with chamfered corners, each with two marble ringed shafts, and the two principal sides have carved quatrefoiled roundel with marble spheres within and at corners. Leaf upper cornice, moulded base with nailhead and leaf carving, and marble columned support of quatefoil centre pier with four columns around. Steps up from E. Marble altar of 1936, in similar, by then very old-fashioned style, with 5-bay cusped pointed arcading, marble shafts and inset motifs in matt-glazed tile (opus sectile) of 4 shield-bearing angels and centre Risen Christ. Alabaster top with carved leading edge. Reredos and E wall cladding look to be of c1870-80, very rich veined marble. Marble wall cladding each side has quatrefoil roundels with mosaic inserts and battlemented cresting. Reredos is of three bays, with short marble shafts to cusped pointed low arcade. Mosaic angels in cusped heads over mosaic frieze 'Glory to God..' and fine square mosaic patterns between the column shafts with IHS, Lamb of God and Alpha-Omega motifs. In arcade spandrels are 2 mosaic crowns in roundels. First World War memorial chancel screen in oak, Perpendicular Gothic style in 3 bays with fine traceried heads to openings, carved frieze with bosses and cresting. Cross above. Earlier to mid C20 oak baptistery screen with seat in arch on N side of baptistery, and along W wall and S wall are matching panelling and seats, probably by W.D. Caroe. Metal C19 altar rails, twisted standards with Gothic leaf scrolls. Brass eagle lectern, later C19, on cast-iron conical base (similar but less elaborate than the one in Dyffryn church). C19 pine Gothic inner porch with half-glazed double doors with patterned coloured glass and symbols of the Evangelists. Fine pitch-pine stalls with column shafted pointed arcading under row of quatrefoils to frontal, column shafts to bench ends. C19 pine pews with cross in roundel motifs in bench ends. Organ of 1927.
Stained glass: Five windows by Celtic Studios of Swansea, of 1960s: in baptistery W and S windows, Baptism of Christ and Suffer the Children; S aisle second window Christ in carpenter's shop; N aisle first Good and faithful servant; and N aisle second Christ on road to Calvary. S aisle third has good High Victorian Gothic window, Angel at tomb, to F.G. Moore, (d 1863), by Clayton & Bell. N aisle third window of 1996, two female saints. Chancel N and S, two 2-light windows in late Gothic style, to Edward and Charlotte Acland Moore, (d 1881), Christ at well and Good Samaritan. E window High Victorian Gothic style, figures on red grounds, Christ teaching, Resurrection and Suffer the children, with 3 scenes below and Christ blessing in top octofoil, possibly by Clayton & Bell c. 1870.