The interior is plain to the point of bleakness- just a big rectangular room, but I liked this little side chapel/mausoleum.
The mausoleum contains this real oddity; it's French and 17th century and the plaque at the base says it was presented to a convent chapel by Louis XIII. I assume some Cartwright picked it up in the aftermath of the Napoleonic Wars when continental junk shops were overflowing with remnants of the old regime. I suppose the flanking figures are meant to be the Virgin and St John but I've never seen them looking so Greek.
These tombstones predate the church (they date from c 1700). The high relief carving is characteristic of the Northants- North Oxfordshire region.