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 photograph doesn't show the surface in any detail - you need to be a lot closer, or to be able to post photographs showing both the context (as you have done), and the detailed view. From this, I cannot be sure it isn't a tar spot!
There are other black Verrucaria species.
Lat/Lng: 51.7, -4.4
OS grid ref: SN3610