Discovered dead in an old cow pat.
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Apologies for the terrible backgrounds but I'm stitching together images from microscope pictures and haven't yet got it right!
Looks like it could be Paederus littoralis but its difficult to judge the colours on these images. See the images on Kerbtier:
Entomologist and biological recorder
The colours are actually much brighter than in the photos - I'll have to work on getting the exposure right!
Lat/Lng: 51.3009, -0.1789
OS grid ref: TQ270573