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A very oddly marked Episyrphus. The grey stripes on the thorax are typical of that species, though.
I'm not sure what the official answer is to the dull, almost translucent edge to some of the abdominal segments. This will be an overwintering specimen, presumably, so it won't be a teneral form. Sometimes, the female abdomen is so bloated with eggs that the membrane between the segments is visible, but that is not true, here, either. I'm sure someone will know.
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Thanks for that, it was good to see them again.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I agree that it must be E balteatus, but the abdominal pattern is very strange. I saw one similar on the Isles of Scilly this autumn and for a moment thought it was something new. Overwintering specimens are generally darker, but this tends to be an overall dusky hue like the one on plate 3 (1c) of the BENHS hoverflies book.
Lat/Lng: 51.2, -1.0
OS grid ref: SU7451