Thanks, I was concerned that it didn't exist since the node was placed inside a built up part of the school, but bing streetside / LiDAR show it's 100m north.

Using that Link I've found it's wikidata item:

https://www.wikidata.org/wiki/Q17645882

I'll convert the burial mound to an area at it's correct location.

If you're interested, the wikidata to OSM tool can also be used to find similiar items:

https://osm.wikidata.link/no_match/relation/1851064