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The brown 'lichen' is actually a liverwort, but the pale leafy bits are lichen.
Thank you for correcting my mistake :)
Could it possibly be Dilated Scalewort (Frullania dilatata)?
Probably - that's the most common species. Feel free to post that as an ID and see if you can get some agreement. Move the observation to plants to attract some bryological brainpower.
Thanks for the help :)
Okay good idea I will do
I have agreed with Nigel as although it is very likely to be Frullania dilatata (is the tree it is on a young Ash?) the location also suggests the possibility it could be Frullania tamarisci which is apparently "Abundant in the west..." the way to tell the difference would be to take a look at the "lobules" which will be markedly different in shape and size.
BBS Species guide pages available here: http://www.bbsfieldguide.org.uk/content/frullania-dilatata
Lat/Lng: 52.4, -3.9
OS grid ref: SN7587