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A female and the greenish wings suggests the Banded Demoiselle.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
As does the position of the false pterostigmas (the white spots on the wings) which are close to the tip.
Why is there such a difference in colouration?
If you mean why are there differences in wing colour between female Banded Demoiselles, it is a combination of factors including age and plain old individual variation.
Lat/Lng: 51.4043, -0.1856
OS grid ref: TQ263688