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It looks a bit like one I put on 14th August. I thought it might be Microcara testacea.
Thanks for that,but the thorax is the wrong shape and the antennae are much longer than Microcara.The closest family of beetles I can find is the marsh beetles-Scirtidae,but I am still not convinced.
Maybe put that id and hope an expert can tell you more. Good luck.
Lat/Lng: 51.7114, -4.7793
OS grid ref: SN080050