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I think S. melanura has black legs and the shape appears too squat.
Sorry ,should read ground beetle ,sticky fingers.
First time to post so unsure if i'm doing this right?
Your beetle is Anchomenus dorsalis
Hi Christian - I'm sure you are right. Click on "Add a revised identification" then fill in the Latin name in the appropriate box and choose how confident you are about your ID.
Thanks for the identification
Lat/Lng: 52.529984059546, 1.562582552433
OS grid ref: TM417984