Plastered and whitewashed interior with C19 stone reveals, segmental pointed arches with stone voussoirs. C19 open rafter roof to nave with arch-braced rafters and brattished wall-plate. Three pink stone steps up from nave and single marble step under screen (see below) which extends right across nave E end. Fine chancel arch behind of 4 chamfers, similar E and W sides, dying into chamfered piers and carried each side on remarkable carved 'green man' corbels. Chancel has scissor-rafter C19 roof, plastered walls except on N side where a broad segmental pointed moulded arch opens into the tower base, the inner mouldings dying into the side piers. Wave mouldings and diagonal stops. Small squint cut through right pier. Tower base has segmental-pointed reveal to window each side, and C19 flat 9-panel timber ceiling. Original stair tower door on W side, Tudor-arched. One step into tower base, 3 bull-nosed steps up to sanctuary. Chancel S window has C19 half-round stone seat in embrasure and small pointed piscina to left.
Screen of exceptional richness and complexity, much restored by Seddon, who added the colouring. Some 19' width, the lower screen itself 18-panel, 7 panels each side of 2x2-panel doors. Linenfold and traceried lower panels, carved band, and traceried open upper panels. Carved and moulded head beam over with 3 bands of ornament, then deep cove (all renewed) of 3x18 square panels with bosses. Above, an intricately carved massive bressumer under loft, nearly 2' deep with 5 bands of undercut moulding. The leaf-carved valance beneath is continued around the curves of 2 fine traceried side brackets on corbels, the tracery restored by Seddon. The loft front has delicate cresting below 18-panel front with intricate tracery in all the panels. The upper beam, some 1'4" deep, is intricately moulded in 3 bands with carved enrichments above and below. The rear of the screen is much plainer, panelled with coved beam at loft level and rough plank panelling in arch pierced with tiny lancets.
Ornate High Victorian font of unusual design, hexagonal bowl, chamfered rim with raised rosettes, underside deeply splayed in to squat marble hexagonal shaft ringed by six ornate columns with highly carved foliate round capitals, marble shafts and moulded round bases. The bases spring from sides of a steeply chamfered hexagonal plinth which carries the base of the centre shaft. Ornate High Victorian round ashlar pulpit on 5 marble columns ringing a sixth, with moulded caps and bases, on 10-sided ashlar plinth. Five trefoil-cusped panels open above small curved panels with brattishing above square rosette. Heavy moulded top cornice. Stone steps up from E. Oak lectern with gabled rotating top, bookrests on 2 sides. In chancel exceptional C19 tiled pavement designed by Seddon made by Godwin to cross pattern overall with panels of encaustic tiles to Gothic designs including the Lamb of God. Other tile panels here and in tower base and sanctuary depict 7 virtues, cherubim, a kneeling priest, and triple lamp. Tiles also to fronts of sanctuary steps. High Victorian wrought iron standards to communion rail. Pink marble pointed cusped niche on chancel N wall. E window by Seddon, Gabriel and Mary, in browns and blues on turquoise ground.
On S wall plaque perhaps from C18 repair: `John Gwin Esq. Robert Wilson Churchwardens 1721 AD'. By chancel arch brass plaque to Rev. William Price d1890 who 'restored both churches, built the school and renovated the screen'. Chancel S plaque to Richard Creed d 1690, son-in-law of the noted Puritan minister and vicar of Llangwm, the Rev. Walter Cradoc, secretary to Admirals Blake and Montagu and later schoolmaster at Llangwm.