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.
This is soaking wet and not giving much away (eg no well-developed soralia), which makes identification difficult, but it might be Parmotrema perlatum (see http://www.ispot.org.uk/node/234567 for a wet but more mature specimen) or possibly a Hypotrachyna sp.
Lat/Lng: 56.0576, -3.878
OS grid ref: NS831865