[3] An obsolete suggestion is that it is a variant of "Upchurch",[4] referring to its position on comparatively high ground; this is unsupported by the early spellings.

[7] The parish was united with that of the nearby church of St Laurence Pontney, also destroyed in the Great Fire but not rebuilt.

The church was originally intended to be much larger, with a structure similar to St. Stephen Walbrook; however for reasons unknown it was rebuilt on a smaller scale under the supervision of Robert Hooke.

[12] 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.

Below it are eight seated female figures painted in monochrome in imitation of sculpture; their precise symbolism has been variously interpreted.

The motif of the gilded 'Pelican in her piety' (the emblem of Corpus Christi College, Cambridge) makes its appearance both on the reredos and in the original copper weathervane made by Robert Bird, which was relocated to sit over the north door after being removed from the spire for safety reasons.

[17] "This is one of Wren's happiest, outside and in...everything inside this apparently demure box is a little bit larger than life and has room to breathe - whereas an Italian designer of the same time would have crammed in twice as much detail and blurred the effect"51°30′42.02″N 0°5′18.05″W / 51.5116722°N 0.0883472°W / 51.5116722; -0.0883472