Not sure which species this is as I don't know enough to tell them apart from this photo. Or maybe it's neither of these!
No interactions present.
The male is the bluest of the blue / black damselflies. The thorax viewed from above bares two broad blue stripes. Just behind the wing roots on the second abdominal segment is a mushroom shaped symbol, the stalk of which may be absent. The upper surface of segments 8 & 9 towards the tip of the abdomen are all blue, often appearing brighter than the rest of the blue areas of the insect.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 50.7223, -1.3851
OS grid ref: SZ435915