I think this is probably a type of woodwart and possibly Hypoxylon multiforme but I believe that's most common on Birch, which I'm not sure this is.
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
In books it does say that it is mainly Silver birch but can be found on other hardwood trees occasionally your looks like Ash tree.
Many thanks Fenwickfield, you may well be right about it being Ash. I spotted a recent post of yours about this variety sometimes being found on other hardwood trees, which is what prompted me to post this observation.
Lat/Lng: 50.75324, -3.52643
OS grid ref: SX924959