Grubbing around today, I found a couple of stones in the surrounding hedge (see photos). The vicar arrived at the same time, but knew nothing about a possible circle. As a service was due to start, I didn't get a chance to get a good look around the church itself, which apparently has some Green Man roof bosses.
I was here on the 16th Feb. Beautiful day but very cold. I took a couple of pics but will come here again, in warmer times, to have a better look and maybe find more stones.