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I'm familiar with M 'o' P, which has quite pointed forewings and a more complex pattern. On your beast they are rounded and obviously very fresh, so not abraded and with a much simpler pattern. I'm not sure what it is, Clouded Silver L. tenerata springs to mind but is also not quite right. However, happy to be told I'm wrong - again!
Thank you for your ID help, (Ardea you are not wrong for trying, you were closer than i was).
Lat/Lng: 54.783223, -4.559648
OS grid ref: NX354461