Firstly, it is the burial place of Francis Saville Kent who, in 1860, was the 3 year old victim of a murder at Rode Hill House (which is about 4 miles from Trowbridge in the other direction). Unfortunately, that photo isn't usable so I may have to go back to take another one - that'll teach me to check properly in the future.
Secondly, and linked to my interest in obsolete local industries, at the rear of the church there is a watercress pond. According to everything I've read this pond is no longer in use but it was definitely planted and being maintained, so maybe it is used to supply locals. Unfortunately there was no one around to ask.
I'm really glad I made the effort to visit this church. It was so peaceful there and is just on the edge of a deer reserve so a return visit may provide opportunites for some photos of the stags - there is a sign on the church gate warning you not to approach the stags if you see them so I may be lucky!