a small brown beetle running up a tree trunk. wondered if it might be a long-horn beetle.
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This isn't Podabrus, which has a different shaped thorax and a more exaggeratedly lenghtened 'neck'. There are several other possibilities including Rhagonycha limbata and Cantharis figurata, but the best match for this combination of head, thorax and leg colours is Cantharis decipiens. See:
Entomologist and biological recorder
Lat/Lng: 52.20241502313, -1.110095501208
OS grid ref: SP609563