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In what situation did you find them? They look somewhat like botfly larvae.
Could be botfly.
They were found within a pile of dead wood.
i think they look more like a wood grub
Not botflies then if found in a wood pile. Possibly Dendrotipula, can't remember the species name. If so, not too difficult to rear. Might already be mature enough to pupate if you put them in a jar of loose soil.
Lat/Lng: 52.3, 1.1
OS grid ref: TM1482