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A Silver Y, they are quite variable, I think.
Revision: the "Rustic" suggestion seems good to my (very) amateur eye - the white marking fits better than with my original thought, which I wasn't anywhere near confident enough to offer as an identification proper.
Lat/Lng: 52.421, -4.041
OS grid ref: SN613822
area with gardens, in farmland, near conifer plantation, with boradleaf copses, generally bit boggy.