I'm assuming this is another Adder but I have never seen one myself that is, for the want of other words, so black and white.
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black zig zag = male!
Brown zig zag = female!
That explains it. There were two of them really close to each other, a pair no doubt. Lovely creatures, it was fascinating watching them.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 50.2, -4.0
OS grid ref: SX6445