Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Thanks AlanS for your comments - this has made me look closer at the photo and research other Xanthoria photos to see the difference - it's not easy but I think I can see why you have identified my photo as X. calcicola.
Lat/Lng: 51.77943, -1.47119
OS grid ref: SP365091
On the edge of a market town, next to a busy trunk road but also next to fields and country lanes