Freen foliose 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.
If you look closely at the lobes they appear to be missing the white markings (reticulation) which would indicate Parmelia saxatilis.
It looks more like a Hypotrachyna - possibly H. revoluta but that's a suggestion rather than a definite ID!
Lat/Lng: 50.4, -4.1
OS grid ref: SX5567