In beech wood.
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It looks like a Green Silver-lines larva, if there were 2 small bright red markings at the rear end it would confirm it? The shape is quite distinctive although I cant personally rule out Scarce Silver-lines, I have only seen the former.
No red marks on it.Lime green all over.
Lat/Lng: 51.8055, -3.1293
OS grid ref: SO222124