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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the young apothecia do have distinct margins, but they are black like the rest of the apothecium. In the slightly odd lichen terminology they are "proper margins", as distinct from the usually white "thalline" margins seen in Lecanora and similar genera.
If I had not noted these well developed "proper" margins I would not have added agreement for Lecidella elaeochroma. Other species, notably Amandinia punctata, can appear very similar and chemical testing is really advised for accurate ID. L. elaeochroma gives a conspicuous orange reaction with sodium hypochlorite (fresh bleach).
AlanS - Thanks. I have a lot to learn about lichens.
Lat/Lng: 51.3565, 0.1736
OS grid ref: TQ514641