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I have never seen one, and the location might be too far to the south, but it looks like C. erythrophthalmus, from Stubbs and Drake. The stigma is large and very dark, and there seem to be silver bands on the abdomen.
Not sure...interested to see what an expert has to say!
My Flickr photos...
Lat/Lng: 51.6204, -0.5042
OS grid ref: TQ036923