A ball of lichen on a fence post. I'd guess that the post is larch.
Edit: Changed to match Synganium's ID. Many thanks.
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.
Lat/Lng: 55.7661, -3.0427
OS grid ref: NT346530