Caloplaca? the yellow lichen
No identification made yet.
No interactions present.
You need to test with K first to establish whether its a Caloplaca (K+ red/purple) or a Candelariella (K-)
It might well be Candelariella vitellina, but the KOH needs to be brought out.
Lat/Lng: 52.023435, -0.71147777777778
OS grid ref: SP885368