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Its a tough one Andrew, it looks quite worn. Have you any idea of scale or any other pics? At first glance it seemed to me to have colouration like a Haworths Minor but having checked what a fresh one looks like it could well be something else.
Yes, tricky one this. Looks like it could be one of the Dart sp. to me. Haworth's Minor would have a shorter profile I think and the stigma would be smaller.
Going on location, it's likely to a heathland specialty.
Lat/Lng: 50.693572, -2.031781
OS grid ref: SY978882