Six legs, pincers, small head attached to segmented body. Black with appendages (straight)from its rear.
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Hmmm... in close-up the 'tails' appear bristly (though it might just be an artefact of blurriness when scaled up) and the segments look flanged - if so, not correct for earwigs.
I believe it probably is an earwig. As far as I know, the appendages from the rear of the body indicate whether the insect is male or female. Male have curved and females have straight - therefore the earwig in your photo appears to be female.
I'm going to have to agree with the "not an earwig" comment posted above by dshubble.
The spines on the two "tails" are not an artefact on the photograph, they are bristles. Earwigs do not have spines or bristles on their pincers. The abdominal segments run smoothly into one another on earwigs, with this beastie there are definate "bumps". Earwigs also have much longer antennae than this insect.
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Is there any way of knowing which beetle this comes from?
I'm fairly confident this is a ground beetle larvae - one of the smaller Nebria or Pterostichus species, perhaps - see http://commons.wikimedia.org/wiki/File:Nebria_brevicollis_lerva.jpg
Lat/Lng: 53.537272455559, -2.2655653953552
OS grid ref: SD824045