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If I am correct with Pipiza I believe it is a very difficult genus to identify species from photographs.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
"This genus provides one of the most infuriating and intractable taxonomic problems one could find anywhere among the British Diptera" !
I'll try and catch the next one I see and send it off to the hoverfly recording scheme.
Jamie from Briantspuddle
Lat/Lng: 50.7, -2.3
OS grid ref: SY8193