Resting on Xanthoria parietina lichen beneath Willow branch.
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Thanks Robert, that looks good.
Unfortunately the reflection of the flash gives this one a particularly unnatural appearance.
There were also Hawthorn, Alder and other trees in the area so I'm happy to leave it at family as you suggest.
Lat/Lng: 52.5, -1.2
OS grid ref: SK5600