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That seems a good guess to me. Going from Waring and Townsend the wing shape looks right, the pattern of black markings towards the leading edge of the forewings also looks spot on and somehow the abdomen also looks like it is right for Freyer's.
It has had its genitalia examined by Rachel Terry and the ID is confirmed.
Lat/Lng: 51.546762058095, -0.33246517181396
OS grid ref: TQ157844