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.
I am inclined to think it is very young Parmotrema perlatum, but cannot be at all sure from the photo.
If it had short, marginal, stubby cilia this would help.
Lat/Lng: 51.4165, -0.0845
OS grid ref: TQ332703