The original Lanfranc's Nave was demolished in 1377, leaving the two west towers. The South West Tower of the Cathedral was re- built by Thomas Mapilton between 1424 and 1434 in Perpendicular style, the work being initiated by the building of a fine south-west porch with a small chamber above. It appears to have been designed so as to match the height of the Norman North West Tower and as such is not especially tall. Internally the piers are the work of Henry Yevele c. 1400 and Mapilton built the south and west outer walls with slight changes in the base mouldings. The tower has concave-sided gablets, panelled buttresses, and ogee window labels. Archbishop Chichele was the patron on the work. The Bell called 'Dunstan' was installed in the tower in 1459, hence the St. Dunstan's name connection.

John Newman, 1969, The Buildings of England: North East and East Kent (Monograph). SKE7874.

Blockley, K., Sparks, M. & Tatton-Brown, T., 1997, Canterbury Cathedral Nave, Archaeology, History and Architecture (Monograph). SKE29723.