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.
Unfortunately the definition of the photograph is not very good. I assume you mean the grey lichen next to the Xanthoria parietina? [I refuse to call it "Leafy Xanthoria" as this is apparently an OPAL made-up name and all Xanthoria species are "leafy".]
The grey species does not appear to be a Parmelia (lobes are too smooth and convex), but as we don't have a clear view, I hesitate to suggest any other possibility. I'd rather not give a highly speculative ID.
Lat/Lng: 51.5002, -0.1262
OS grid ref: TQ301795