In reality more grey than shown in image. Growing up in the middle of a large (30cm+) black lichen and cladonia and mosses.
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.
I wondered if it might be Lichenomphalia umbellifera (amongst other synonyms), the Heath Navel, though this is usually coloured as in the photo rather than the greyish colour you mention. Though Arrhenia (or Omphalina) griseopallida can be a pale grey-brown when dry, it would also be more funnel-shaped I think. Certainly the grooved radial structure of the convex cap strongly suggests Omphalina or a close relative.
Looks like Omphalina pyxidata to me
Wondered about pyxidata too - worth putting in as an identification?
Lat/Lng: 51.946119, -0.676544
OS grid ref: SP910283