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The abdomen pattern is shared with E. abusivus (though that tends to look a bit more orange and hairy). Colour and abdomen pattern are quite variable in Eristalis, though, so it helps to get pics from different angles.
My Flickr photos...
Good advice; will try in future.
Lat/Lng: 50.799, -3.453
OS grid ref: SS976009
National Trust property that includes formal gardens, meadows and woodland.