This hoverfly has been infected with an Entomophthora fungus (see comment below). Entomophthora means 'insect destroyer' in Greek.
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It's infected with an Entomophthora fungus, appearing between the abdominal segments, as usual. It's not uncommon to find several of these together atop grass stems, all similarly affected.
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It does look like mellinum but I am not sure about the leg markings - good call
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thanks, that's going straight in the Fungi section
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Lat/Lng: 51.7597, -0.1757
OS grid ref: TL260083