Stenolophus mixtus
There seems to be some variation in how obvious the red shoulders are on this species - very clear on this one.
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Stenolophus mixtus showing rear side of elytra and back of pronotum, North Elmham (Norfolk, UK), 25th June 2023
Stenolophus mixtus, North Elmham (Norfolk, UK), 16th June 2021
Stenolophus mixtus, Hills and Holes (Norfolk, UK), 21st May 2020
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Stenolophus mixtus showing rear side of elytra, North Elmham (Norfolk, UK), 26th June 2020
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Stenolophus mixtus, North Elmham (Norfolk, UK), 17th July 2019