Bucks county council call this a Bronze Age burial mound on which a windmill was built.
I don’t know if this is significant but it lies almost exactly opposite Danesborough Camp seven miles away on the Brickhills.
There are some old wooden planks on top partially buried, perhaps part of the windmill.
I seem to be following in the footsteps of Glennancy who visited these sites around MK eight years ago. Do you still come on here ?