The ceiling of the church takes the form of a dished cupola pierced by four elliptical openings, which become almost circular externally in the dormer windows. The cupola springs from four plain brick walls, has no external thrusts, and spans more than forty feet across. It was painted with the present decorative scheme in 1708, when the whole church went under repair and beautification. The artist was almost certainly William Snow, a member of the Painter-Stainers' Company, who lived in a house just to the north of the church; the church's accounts from the time list payments totalling £170 to a "Mr Snow", without, however, specifying the services rendered. Painted in oils directly on the plaster, the decorations are divided in two horizontally by a painted "Trompe-l'œil" cornice. Above this a choir of angels and cherubs in adoration surrounds a golden glow, in the centre of which it the name of God in Hebrew characters. Below it are eight seated female figures painted in monochrome in imitation of sculpture; their precise symbolism has been variously interpreted. The painting was restored once in the 18th century and twice in the 19th. before the complete rebuild and repainting of the decorations following the end of the Second World War.