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I suspect this is a syrphid larva, but I don't have Rotherhay, so haven't been able to get much further with the ID. Collected today from an East London Cemetery Park. It was sheltering near the base of a Carex remota Remote Sedge, only a couple of feet from a pond. It measures 10mm at rest and about 13mm when stretched to full racing mode. I would be happy to rear it if someone could give me some advice on what to do (note that my record with hoverfly larva is dismal, so perhaps I had better release it:()