St Andrews Church, Blickling, Norfolk
On the corner near the entrance.
This church is medieval but had lots of work done to it in the 19th century. Still, it looks wonderfully old!
I took this photograph thinking it was perhaps a stone masons mark but actually it turns out to be an Ordnance Survey benchmark. I’ve only just discovered this fact and can’t say any more about them except that in rural areas they were commonly used.