Two exciting discoveries were made recently when reviewing the priorities for repairs outlined in the Quinquennial Review with church architect Brian Haward. Firstly, looking at the east end of the chancel where stones and flint had fallen out, Brian remarked that this east end is "very special" because it contains gallets (for details of galleting see: https://en.wikipedia.org/wiki/Galleting ). The photo above shows an example of this; small pieces of knapped flint have a face worked on them and are then placed between the flint cobbles or stone. We understand this is relatively rare in Suffolk though more common in Essex and Norfolk.
Galleting is used to fill in the unsightly mortar between ill-fitting stones which cannot be easily shaped by the masons when put into position. Or it could have been used to protect the mortar against the weather, but apparently has very little structural or aesthetic purpose. It has also been suggested that it may have been a superstitious practice which attempted to protect a building from evil influences.
Also, when inspecting the raised wooden floor in the south aisle, Brian noticed a star-shaped carving on the edging rail that may have been a carpenter's mark; see photo below: