Welsh slated roofs with red ridge tiles
West doorway has roll moulded arch with carved poppy heads, supported on colonnettes with stiffleaf carved capitals
Tall window, with colonnettes with foliated capitals, casement moulded arch with carved ball flowers and dripmould
2 light west lancet, tall Early English style tower arch with chamfered reveal and attached colonnettes with stiffleaf caps, and arch with undercut roll mouldings, outer arch full width of nave has tall colonnettes, with amulets, stiff leaf caps, and arch with carved dog tooth and poppy head ornament
Outer arch with carved dog tooth ornament
Encaustic tile floor
Carved with gilded marble, mosaic panels
The pews in the nave are of similar date, with bench ends carved with the emblems of St Andrew (cross), St Nicholas (anchor) and St Mary (fleur-de-lys). Altar stone in Blessed Sacrament Chapel incised with crosses and has a cavity for reception of relics
MEMORIALS: include several reset from earlier church, including 15 black or cream incised slabs dispersed through nave and transepts of C17-C18 date, among most important being Rebecca and Bostock Toller (d.1718, 1721) a large black marble slab incised with inscriptions and with relief carved armorial hatchments and 'memento mori'. South transept has large wall tablet, white marble on black marble background slab, commemorating Nathaniel Dimsdale, Baron of the Empire of all the Russias, (d.1811), who together with his father, had inoculated Catherine the Great against smallpox, and had been the Divisional MP
STAINED GLASS: late C19 chancel windows, east window Crucifiction, with Christ in Majesty in rounded above, attributed to Hardman, north-east and north-west windows in style of C16 glass show St John and St Andrew and the Virgin Mary, and Archbishop Theodore, St Nicholas, and a centurion
Royal Commission on Historical Monuments (England): An Inventory of the Historical Monuments of Hertfordshire: London: 1910-: 112-3