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My first thought was that this is a hoverfly larva and my second, a larva of a Green Lacewing. However the “pincers” seem rather small for a lacewing and though some hoverfly larva have them, they represent a very small minority, in the images that I have seen so far. Also these species are of quite different bodily appearance to the individual here.
Hoverfly larvae don’t have head capsules (See Rotheray in Dipterists Digest No. 9, p.5). This larva does appear to have a head with eyes, and if so, it is therefore not a hoverfly larva. The “pincers” seem to be concerned with harvesting material from leaf hairs, at least in daytime.
Larval length about 5 to 6 mm by, er., rule of thumb.
Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707