The white crustose lichen with fawn apothecia is, I think, Lecanora chlarotera. But what are the black bits poking through it?
No identification made yet.
No interactions present.
photo quality needs to be pin-sharp, no camera movement.
But whether this would give an answer I don't know.
Yes, I think this is Lecanora chlarotera, and it has its share of parasitic fungi, but I cannot think of anything that matches what we (almost) see here.
There is an Arthonia subfuscicola, recorded in Britain on Lecanora carpinea (which this might just be) and L. albella, and elsewhere it does indeed occur on L. chlarotera, but it is very rare.
More likely it is something competing with the Lacanora. Maybe.
But without a clear view, this has to be just speculation.
Lat/Lng: 55.4737, -3.2026
OS grid ref: NT240206