No identification made yet.
No interactions present.
Identifying anything in this blurry lichenscape involves a bit of squinting and a lot of guesswork. Parmotrema perlatum would be my wild guess for one of the species here.
that any ID here has to be a wild guess.
I am afraid that it has to be accepted that some photographs are best deleted on first viewing, so that their souls can drift away into Pixel Heaven.
Lichen photography is not easy, I know that only too well. Always best in this digital age to take multiple shots, in the hope that something will be useable.
Photographing lichens is difficult, but don't give up. Alan's website shows what can be achieved. http://www.lichens.lastdragon.org/
It may help you if you look at some lichen keys to see which features are required for identification. Then you can try to ensure they are in your photo, or at least in your description.
iSpot is currently producing keys for beginners and experts. This one is a dichotomous key,
http://www.record-lrc.co.uk/Downloads/A Key to Common Lichens on Trees in England.pdf
Listed under the 'key' tab on iSpot Home page are several lichen keys.
After using the keys you may be able to identify it yourself.
Lat/Lng: 51.4523, -2.5886
OS grid ref: ST591727