Looked superficially like Black Witches Butter, but rock hard!
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
The overall appearance doesn't agree with my experience of this fungus sofar.
Its look is more like that of hardend boiling pitch
I agree but cannot think of an alternative
Lat/Lng: 51.59451, 0.28433
OS grid ref: TQ583908