St Nicholas' Church, Potter Heigham

Our second walk of the weekend took us from Ludham, through Potter Heigham on to Weavers' Way and finally back into Ludham and a well deserved couple of pints in the King's Arms PH.

Nearly half way round we passed Potter Heigham church which according to Wikipedia is dedicated to St Nicholas, the patron saint of fishermen and children. The earliest surviving feature is the round tower, which dates from the 12th century and has a 14th-century octagonal extension, one of the best preserved in the country.
It is famed for its hammerbeam roof and the almost unique 15th-century brick font. The church also contains a scheme of wall paintings dating from the 14th century, the most readable of which depicts the Seven Works of Mercy. When the roof was re-thatched it required about 1850 bundles of reed. It is one of 124 existing round-tower churches in Norfolk. The church is a Grade I listed building.
Unfortunately I haven't yet found an explanation for this curious carving over the church door.