In the Farthing Downs ligh trap.
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Simple if you get a photo from below!
My Flickr photos...
Next time I'll ask it to turn over for me! But Waring & Townsend says the male Clay and the White Point have similarly marked abdomens.
Lat/Lng: 51.2989, -0.1345
OS grid ref: TQ301571
Came to a light trap next to chalk grassland with woods nearby