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 cannot make out what this is - the photograph needs to be in better focus.
However, it is definitely a crustose species and, frankly, not at all like Physcia.
Note added in edit: this might well be Haematomma ochroleucum, which likes gravestones. Unusually green, but maybe there are algal cells on the surface.
Lat/Lng: 51.3244, -2.9328
OS grid ref: ST350587
Lichen found at church graveyard in Hutton.