a hoverfly with a nicely upholstered face
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arbustorum has the pale face, but males have the yellow on tergite 2 reaching the hind margin of the tergite, so that they only have a small dark wedge in the middle of that tergite. The pattern is very different to this.
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Lat/Lng: 51.5942, -0.0866
OS grid ref: TQ326901