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I see the similarities in the 2 species you mentioned, having looked closely at the illustrations in Waring, Townsend and Lewington, Im inclined to agree with your 2nd suggestion of wormwood pug. There are a few things in the pictures which seem to point more to wormwood.
You should possibly think about posting an alternative ID?
Lat/Lng: 51.2388, -0.1276
OS grid ref: TQ308505