Looked like a Dragonfly but with a Caterpillar's body.
No interactions present.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
This is a female as the anal appendages are set wide apart. The colours will dull with age. The male's abdomen however will turn a fine powder blue. An impressive insect indeed.
Lat/Lng: 51.575, -0.7853
OS grid ref: SU842869