being a filled-in gap between the tympanum and the door arch and suggests that the tympanum is older and was brought from a church elsewhere or else that the whole doorway was recontructed at some point. Whatever the answer, the whole doorway seems to me to not quite fit together. Either side of the door, both inside and out, are slabs of stone with very weathered decoration. These sit between the decorated (but, again, badly weathered) pillars and the door itself. That is very unusual and to have decorations inside the door is even more so, although the likely explanation is that these were originally outside.
The tympanum is Christ in Majesty supported by angels on either side. It is crude and engagingly naive and, again, is reminiscent of Saxon rather than Norman art. The decorations on the door posts and jambs are hard to discern now, and on the inside at least it is clear that there has been some re-ordering of the slabs which makes identification of specific themes and images nearly impossible.
The north side is difficult to access because that is where the moat is. If you scramble round, though, you will find a c12 door with a square crudely decorated lintel. The chancel arch masonry is c12 but was reconfigured into a pointed arch in c13. The bell-cote too is c13 - a quite elegant one of its type.
This is not, to be sure, one of the great churches, but it is full of interest, particularly that south door. It is a crying shame that no way has been found to protect it.