Lichen carpeting the sandy area. Bit confused as some bits look like a cladonia and other bits look very leafy.
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Interesting, just checked nbn map and there are no records of this species within about 50 miles of where I found it, are lichen records thin on the ground on nbn? The species is covering the ground over many square metres, you can't really miss it if you go to the site.
C. foliacea is one of the species in which basal squamules predominate, and they can be difficult to sort out. With your photographs it took me a while to be reasonably sure they were not C. cervicornis (the scale was useful) and I spent a while comparing them with my own C. foliacea photographs. So we have a semi-critical species that may well be under-recorded.
Much lichen recording on the NBN comes from the BLS atlas scheme, many of the records for which were made quite a long time ago (note the date delimitations on maps in the new 'Dobson'). Bearing in mind the dynamic nature of Cladonia heaths, it is entirely possible that even if your site has been visted by a lichenologist, C. foliacea may have been rare or absent then.
Inland records of C. foliacea, Breckland excepted, are always likely to be good discoveries.
Lat/Lng: 51.958733888889, -0.63937694444444
OS grid ref: SP935297