Found extensively on the bark of wild cherry trees (Prunus avium), but only on the sheltered side
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.
I've had a much closer look and you are right - it is Trentepohlia!
Lat/Lng: 51.3099, -0.1861
OS grid ref: TQ265583