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Thanks ophrys,I haven't seen one with yellow and orange colouring before,do you know if this is common?
Yes, you do see it quite a bit, especially the last couple of tergites looking orange. Worth checking out, as it can lead to something different. A large Syrphus with orangey markings, but a darker thorax, could turn out to be Eriozona erratica, for example.
My Flickr photos...
Lat/Lng: 57.4551, -2.7708
OS grid ref: NJ538407