Growing on siliceous rock. In second picture lichen is dry. In third picture lichen is wet. Possibly Caloplaca ceracea.
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: 51.7231, -5.2153
OS grid ref: SM780076