How about a church on a possible hillfort?
The church at Edlesborough in Bucks is on a high promontory. It first came to my notice whilst leafing through an old book of parish churches - a faded b/w photo showed a church on top of an embanked hilltop.
My only visit there so far was disappointing - it was pouring with rain, and the hillside is now covered with mature trees, somewhat spoiling to view of the promontory. One to check out in winter when the trees are bare I suspect.
