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I think that this is a beetle larvae of some description. No idea which though. Sorry!
For more of my natural history photography check out:
I think this may be a rove beetle larva but can't be certain from the pic. If you have any other pictures - check the claws on og the feet - if it has two claws per leg its most likely a ground beetle - if one claw per foot then a rove beetle.
I don't have any other pictures. I'm happy with the id as 'Beetle Larvae'.
Lat/Lng: 51.505, -3.1452
OS grid ref: ST206790