white crustose lichen with a green edge and brown/red spots
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.
Its not Leproloma vouauxii (now known as Lepraria vouaxii) as that never has apothecia (fruiting discs) which can be seen in your photo.
If the colour of the apothecia is accurate it could possibly be a Haematomma species but that's a just a suggestion and not a definite ID as its not possible to see any details clearly.
Lat/Lng: 53.8, -1.6
OS grid ref: SE3134