Grey frong like lichen growing on a wooden park bench next to the river.
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.
It looked a bit like this (but this grows on rocks (not wood) and does not have the spiky claws at the ends)
This looks a better match:
Lat/Lng: 52.1976, 0.1175
OS grid ref: TL448575
Sheeps Green on a park bench.