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Do you any higher resolution images, or an estimate of size?
There is a key to Agriotes species in Beetle News vol. 2 no. 1, available from the Amateur Entomologists' Society website:
Entomologist and biological recorder
The photos I got werent very good but have uploaded a higher res one. They were about 10mm.
Gardening for Wildlife
Lat/Lng: 54.9, -5.2
OS grid ref: NX0061