Anotylus rugosus
Apparently a very common species and a relatively straightforward one to identify once you're familiar with it. I wasn't, so keyed this to subfamily using Hackston and then to species using Lott.
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Anotylus rugosus showing pronotum (2 views) and head sculpturing, Wendling Beck Environment Project (Norfolk, UK), 9th August 2023
This one from the garden moth trap pre-dated the one above but was examined more recently.
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Anotylus rugosus showing pronotum and head sculpturing, North Elmham (Norfolk, UK), 24th June 2023
This one was found in a pitfall trap (in propylene glycol, so no live photos).
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Anotylus rugosus showing antennal scapes, head, pronotum and scutellum, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024