Bit unusual to see this growing on large rotted log, normally on smaller twigs.
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 is liable to be this but as I found recently there are other Marasmiellus that look like this
Lat/Lng: 51.750875277778, -0.76335833333333
OS grid ref: SP854065