[mdjlucan]

I was digging my allotment over When I found Anyone know what it is






Title clarified for search purposes

[mumofstig]

Horse fly larva maybe 

[Dr_Pepper]

looks like a beetle larva of some description

[Aunt Sally]

looks like a beetle larva of some description

I'd say so too. 

[jambop]

Could it be a cockchafer grub?

[SnooziSuzi]

From the pic it looks like a Ghost Swift Moth grub.  They mostly feed on tap roots, so things like doc plants, but if you had crops in with a tap roots when the adult was laying that stay in over winter then you might find they attack those as well.

Chickens and wild birds love them as a treat.

[SnooziSuzi]

Actually, on closer inspection it DOESN'T look like a Ghost Swift Moth!  I only saw the thumbnail pic and didn't see that it looks flatter and appears to have pincers.  But then I'm only using my smartphone and not a pc.