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I am sure it's a small blue and if you zoom in there is a slight hint of blue to be seen on sooty brown uppersides.I also would note that it is feeding on white clover which is of the pea family preferred food vetch which is also of the same family
Ann has managed to catch the thin white edges to the very dark wings, typical of this species.
Lat/Lng: 52.508, -1.794
OS grid ref: SP140900