I think this is the Glistening Inkcap fungus (Coprinellus micaceus) which clusters around tree stumps. On its surface, there is a fungus gnat (species not yet identified).
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.
Lat/Lng: 51.43372, -2.76236
OS grid ref: ST471707