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This looks like one of the click beetle larvae - also called wireworms (some species are serious agricultural pests - others just feed on dead organic matter).
Thanks, Rob. I had considered that it was one of those but some of the beetle larvae look so similar that I wasn't certain.
My mum said that she finds lots of these when she's digging her vegetable patch.
Lat/Lng: 52.7, 0.3
OS grid ref: TF5820