I merged this with the boundary stone node on the road, based on geograph evidence and the official list entry in the National Heritage List for England.

https://www.openstreetmap.org/changeset/169243583

If this is wrong, and you’ve surveyed it, and the boundary stone really is inside a barn, then please revert my edit.

Otherwise please double-check what you’re doing when you make edits. It seems really unlikely that a boundary stone would actually be inside a barn.