I think this is the very common click beetle Athous haemorrhoidalis.
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Since this very early posting there have been dozens of A haemorrhoidalis posts.
So, after all those years, I agree (though I'm quite new).
One wonders how it got its nasty name!
d (trawling history)
THREE MARINE PROJECTS
Lat/Lng: 52.8, 1.1
OS grid ref: TG1430