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That pronounced curve in the outer crosslines on the forewings, according to Waring and Townsend is diagnostic for Mottled Beauty. And it's very clear on your specimen.
Thanks moremoth, that was one of the things that pushed me towards MB, I looked at WTL 2009, THE 2 species are on oppositte plates and this is helpful for studying the differences.
Thanks for the confirmation.
Lat/Lng: 55.0781, -6.0622
OS grid ref: NW408835