Unident Grub

Unident Grub

Observation - Unident Grub - UK and Ireland. Description: A very large (from my point of view) Grub measuring approx 4cm in length when straightened. Anyone got any ideas what group or even species it belongs too?

A very large (from my point of view) Grub measuring approx 4cm in length when straightened.
Anyone got any ideas what group or even species it belongs too?