Found this in are back garden in Suffolk, UK.

Can anyone tell us what it is? OUr best guess is that it's the larvae of something....


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I think it is a beetle larva.

I certainly can't ID to species or even genus but I would hazard a semi-educated guess that this is a rove beetle (which is the Staphylinidae family). This  family includes the relatively well known "devils coach horse" but there are quite a lot of rove beetles in the UK too.

Indeed i agree to beetle larvae, i'm not up on those, but point you also to carabid beetles - family Carabidae (i.e. ground beetles) also. Would be a helpful garden guest - a predator of other inverts that may be considered pests.