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Maybe an elephant hawkmoth. but image is very poor.
Wild Flower Society member
Not an elephant hawkmoth, far too early in the year for a large larvae like this. Possibly a drowned Noctuid larva of some sort?
Tachinid Recording Scheme
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I'd agree that Noctuid larva would be a likely ID for this, although probably difficult to get much further than that.
Lat/Lng: 51.471310964545, -2.5885516405106
OS grid ref: ST592748