One of these barkspot/tarcrust things on beech.
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.
might be Biscogniauxia nummularia
I'd just come to this conclusion too! It's the nearest thing I can find in any of my guides.
Lat/Lng: 51.803934, -0.574922
OS grid ref: SP983126