I think this is a lichen, although some parts looked almost plant like.
NB Have since been told it is a liverwort
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This is a liverwort (Marchantiophyta) - a type of 'lower plant', not a lichen. You might get it identified if you move it to the Plants category. I think it's a Frullania sp.
Thanks Nigel, hadn't thought of liverworts. Will move it to plants and see what happens.
Lat/Lng: 52.9109, -3.7695
OS grid ref: SH811362