Pale greeny-grey foliose lichen with whitish lines on upper surface.
Sorry, I do not know English trees, needing flowers, leaves etc to even have a guess.
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.
the lichen itself has not developed diagnostic characters.
Probably it is P. sulcata, but ID just to genus is safer.
Thank you. I will stick to genus for most postings, even they are rather tentatively posted, but I enjoy having a go, hoping to learn from my mistakes.
Lat/Lng: 52.64511, -3.01951
OS grid ref: SJ311057