Interior
Whitewashed plastered walls with ashlar dressings. Ornate hammerbeam roofs on corbels, 7 main arch-braced collar trusses with tracery above collars, 6 intermediate trusses without corbels of arch-bracing. Seven-bay arcades with 2-chamfer pointed arches, hoodmoulds, carved stops, octagonal piers and bases. Wood-block floors. Aisle roofs have arched braced beams on corbels. Segmental-pointed E arch to each aisle with hoodmoulds and carved stops. SW porch, under tower with terrazzo floor, segmental-pointed doors to 3 sides and window to S, coved boarded ceiling with ribs. W end baptistery projection with segmental-pointed arch and hoodmould, stone roof within. Chancel arch, broad 2-chamfer, pointed, the inner arch on column shafts with Art Nouveau carved head corbel each side. Chancel has terrazzo floor, panelled boarded segmental-pointed roof in 12 panels. Segmental-pointed arches N and S. S wall has pointed 3-bay arcaded recess, framing piscina and 2 seats. Holy Trinity chapel in S transept has scissor-rafter roof and one arch-braced collar truss. Arch from N aisle gives onto passage behind organ. Choir vestry with boarded panelled roof to N in N transept.
Fittings: Pews and stalls of American oak 1913, stalls with pierced traceried front. Exceptionally ornate Austrian oak screen of 1925, 7 bays with openwork crocketted gables and finials over ogee crocketted arches, the gables infilled with delicate tracery, and finials between gables. Lower rail with flower and leaf motifs, open traceried panels below and inscription scrolls along bottom rails. On each of 8 posts, a statuette under crocketted finial.
Reredos and panelling to E wall, highly carved with blind tracery panels, cresting and finials. Austrian oak centre square panel of Crucifixion with SS Mary & John in carved floral border under ogee canopy with cresting and finials. Two blind traceried panels each side with canopies, then 2 outer full-length panels with attached thin shafts with small statues under canopies, SS Catherine and Cecilia. Outer 2-bay wall panels each have statue on corbel: SS David and Teilo. Altar below has centre roundel with 6-pointed star framing sexfoil and traceried panels each side with vine, corn, lily and passion-flower motifs. Diagonally-set outer piers each with 2 columns. Traceried oak altar rails.
Pulpit of Austrian oak on Caen stone base with 5 squat column shafts, Gothic with ornate ogee blind tracery, vine cornice and front figure of Good Shepherd.
Reredos in Holy Trinity chapel, Austrian oak with 3 blind tracery panels, the centre one with canopy over carved Crucifix. Outer piers have 4 small statues of Evangelists under 2 canopies. Panelling each side, panelled altar with Celtic cross. Chapel also has traceried oak screens to aisle and to chancel.
W end ornate font of carved stone, octagonal with traceried panels, the front panel with shield and dove, the shaft ringed by 8 green and red marble shafts with ashlar linked vine-leaf capitals. Carved oak angel lectern in nave, brass lectern in chapel dated 1909. Organ in chancel N arch in panelled case, minimal gothic framing to pipes.
Stained glass: E window by A L Moore & Son, of 7-lights, Ascension with Nativity and Angel at the Tomb, 1913, W window 1961 signed by G B Cooper-Abbs of J Wippell of Exeter, to W Rufus Lewis, 6-light, Good Samaritan, works of mercy and 10 pioneers of medical research.. Baptistery 3 narrow lights 1922, Christ, St Luke and Virgin and Child. S transept S window 1960 'The Majesty of the Crucified Saviour' with Nativity, Baptism, Christ as teacher, and Transfiguration; with marks of Wippell and Cooper-Abbs. N aisle W window 1950, early life of Jesus, by Celtic Studios, Swansea, probably designed by B T Evans.