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It could be E. tenax, however other Eristalis species have similar rat-tailed maggots. This is a young maggot (or a very large spoon!), I've caught ones which are over 7cm long, including tail, fat and 'hairy'. I afraid I don't know how to tell them apart.
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Lat/Lng: 51.3, -0.1
OS grid ref: TQ3468