Yellow crustose lichen
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.
You describe this as being crustose, but X. parietina is foliose. I'm fairly sure it's not that. Do you happen to have a closer shot?
Lat/Lng: 50.8, -3.7
OS grid ref: SS8501