Mustard yellow in colour, flaky texture and approx 15cm wide.
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.
If you have a go with the Natural History Museum's 'Guide to lichens on twigs' identification key at the link below you should be able to identify this lichen.
That was really helpful, thanks very much, Hayley.
If you now add the name to this post I can give you an agreement for it
Lat/Lng: 55.029, -7.3465
OS grid ref: NV584835