Amischa analis
Apparently one of our commonest beetles.
This was found in a vane trap in my garden and subsequently identified from its spermatheca, supported by the shape of the 8th tergite hind margin. The photos of the abdomen were taken in case I needed to key it properly (if the spermatheca proved not to be conclusive) and required detail of the abdomen that would have been lost on clearing it to access the spermatheca. As it turned out the spermatheca appears to be distinctive - other members of the genus can be quite similar but none share the same tergite 8 detail.
female Amischa analis showing abdomen from above and below, spermatheca (2 orientations) and tergite 8, North Elmham (Norfolk, UK), 2nd May 2024