Hello,
I think that something gone a bit wrong here.
After this changeset, https://www.openstreetmap.org/way/1287508458/history is aligned with the area of the agricultural building visible on aerial imagery, but the building type is "house (site of)" and the name seems a bit odd for an agricultural building.
If you look at https://overpass-api.de/achavi/?changeset=158935998 and zoom in you can see what happened - that name and building type corresponds to something that was here a long time ago ("ty'n y nant" - "the house in the stream").  That was added in https://www.openstreetmap.org/changeset/151963821#map=15/52.39429/-3.92576 .  I've no idea what the source was since that changeset doesn't say, but whatever it is that name and building type probably belongs on https://www.openhistoricalmap.org rather than here.
I'll update that (and the others).
Any questions about how to spot these, please get in touch!
Best Regards,
Andy

