Tower entirely early Cll and the only English example of a Saxon tower with a four-sided shingled roof or 'Rhenish helm'.
Typical Saxon triangular headed windows can be seen as well as the Saxon long and short work in the vertical pilaster strips. Roman tiles from a derelict villa can also be seen.
The north west chapel was built by the Knights Templar after 1154 as a separate chapel from the church
was opened up into the church by the Knights Hospitallers in the C14.
It fell into ruins soon after the dissolution of that order in 1538.
The church contains some importent examples of Saxon sculpture.
References Anglo Saxon Architecture H M and J Taylor Vol II 558-62 Cambridge 1965.