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.
M. fuliginosa is a difficult species to photograph, especially in contrasty light and, as here, it is difficult to get sharp photographs of the isidia. However, what we can see of the isidia and the shapes of the lobe tips point to M. fuliginosa and not to a Xanthoparmelia. Nigel's first instinct was correct!
Lat/Lng: 50.6832, -2.5708
OS grid ref: SY597872