Flowery, green lichen relatively flat to the adjacent surfaces.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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The photograph appears to show a crustose rather than a foliose lichen. From the bluish colour it could be a Lepraria sp.
It doesn't help being frozen, many thanks will change it, I had a huge debate as to wether it was algae but no.
My comment above was just a suggestion and not a definite identification!
Would it be possible to post a clearer photograph that would show more detail?
I am going out again this weekend. I go to work in the dark and come home in the dark. So Sat morning is revisit time.
Lat/Lng: 52.17456, -2.20732
OS grid ref: SO859529