Ant Beetle Thanasimus formicarius
Known as Ant Beetles due to their mimicry of Velvet Ants. I think it's the commonest member of the family and the only one I've found so far.
This one was on a conifer trunk, found by torchlight at night.
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Ant Beetle Thanasimus formicarius, Cranwich Heath (Norfolk, UK), 14th March 2020
This was also on a tree trunk, found by day.
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Ant Beetle Thanasimus formicarius, Wendling Beck Environment Project (Norfolk, UK), 18th April 2022
Again, found on a tree trunk - Oak if I remember rightly though I didn't make a note of it.
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Ant Beetle Thanasimus formicarius, Bircham Common (Norfolk, UK), 30th April 2014