Ilybius ater
Some references use a vernacular name for this species: Mud-dweller.
The majority of these were identified using Mike Hackston's keys (I might have used Duff for the most recent one).
Ilybius ater, North Elmham Cathedral Meadows (Norfolk, UK), 10th July 2021
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Ilybius ater, North Elmham (Norfolk, UK), 21st July 2017
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Ilybius ater, Thompson Water (Norfolk, UK), 19th March 2017
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Ilybius ater, North Elmham (Norfolk, UK), 14th August 2017
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Ilybius ater, North Elmham (Norfolk, UK), 14th August 2018