Lichen on sandstone rock
No identification made yet.
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I think this is one of the awkward ones - crustose lichens that have dark or black apothecia without thalline (thallus-coloured) margins. If so, there are a lot of them (eg in the genus Lecidea) and many can't be identified from a photograph. It's possible that this one can be, but I don't fancy my chances.
Lat/Lng: 51.958558611111, -0.63881138888889
OS grid ref: SP936297