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This is of course an adult rove beetle rather than a larva - the wings are there, but folded up (sixteen times, I've heard) underneath those tiny elytra. The reason may well be related to their scorpion-like defensive posture - they can't bend the tail upwards if the wing cases are of normal length.
This looks like a Quedius (or possibly Philonthus) species, but I can't quite see the details needed to get any further (eye shape and position, punctures on the pronotum). To be honest, most staphs are microscope jobs.
Lat/Lng: 51.576, 0.489
OS grid ref: TQ725892