While fencing this was on one of the end fence post's .
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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You're probably right with your ID but is there any chance of a sharper photo to be certain?
i've seen this crustose lichen around Duchy as well stumpy! interesting how this particular yellow one is obvious on the older concrete features around the site
I also think you are right with Xanthoria calcicola as the main lichen present but there are also grey crustose lichen patches and maybe other crustose present.
I also think this is likely to be X. calcicola, but as Jenny has implied, a sharper photograph is necessary to confirm diagnostic characters.
The main other obvious lichen, forming fairly large, rounded patches, is Lecanora campestris.
Lat/Lng: 50.2, -5.4
OS grid ref: SW6441