Could this be a funeral bell ??
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
The stem is wrong for Kuehnoromyces mutabilis it looks more like Psathyrella but at a mature stage,photo's of the gills would help with the identification.
Lat/Lng: 51.7095, -4.0942
OS grid ref: SN554032