I think that this is a liverwort. The leaves were green on both sides. Found on the horizontal part of a grey barrel gravestone.
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Its a lichen rather than a liverwort, a Cladonia species
Its a lichen, perhaps cladonia but I'm not an expert so could easily be wrong, there is a moss in the background
Thank you and Jenny for that. I did have a doubt because the leafy bits were't very flat.
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Yes looks like it!
Lat/Lng: 51.6, -0.7
OS grid ref: SU9698