Grade I listed

The church actually consists of two churches joined lengthways, the western church dates back to the ninth century with a 10th century tower, and is one of the earliest remains of Saxon architecture. The chancel was demolished to make way for the later church. The Saxon church consisted of three parts, the central part being the tower which served as a nave. To the west was a baptistery, and to the east there was a chancel. The church was enlarged around the time of the Conquest and a bell stage was added to the tower. The Saxo-Norman nave, chancel, and apsoidal sanctuary were added in the late 11th century. Soon after, aisles were added and later enlarged. The chancel was rebuilt in the 15th century, and the clerestory was added to the nave. The south arcade dates from the 14th century and is of five bays, although this was reduced to four with the building of the chancel, the original sanctuary being replaced. The north arcade is decorated with some reused 13th century material. There are several 14th century grotesques and human heads which form label stops to the arcades.

There is a 15th century Rood screen.

There were major restorations in the mid 18th century and in 1858, with further restoration by Fowler in 1897 when the organ chamber was added.

The church was closed in 1970 and is now in the care of English Heritage. Extensive excavation was conducted between 1978 and 1984. The churchyard is reputed to have over 2800 burials.

The church has two stained-glass windows, one on the north side of the nave, and the other is blocked with only a glimpse visible near the toilets.