Flimsy toadstool which shriveled when the sun got up.
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.
It looks like one of the inkcaps to me. Mycena pura is not as delicate, has a thicker stipe, is usually a lilac colour, and does not have a pleated cap.
The Inkcap, with its cap shaped like a Japanese parasol, would match 'Pleated Inkcap' or Parasola plicatilis.
Lat/Lng: 52.37313, -1.54947
OS grid ref: SP307751