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.
It is very pale, almost ghostly, and has numerous black spots that might be part of the lichen (pycnidia) but which might well be a parasitic fungus of some sort. Fungal parasites on lichens are a study on their own, and still being worked out.
Thank you for your comments.
Lat/Lng: 54.8933, -2.08392
OS grid ref: NY947553
Sheltered location in light shade.