No interactions present.
It looks very much like this 7-spot has been attacked and has lost one half of it's elytra.
I agree with you Andy, it's a 7-spot and the damage is probably due to predation. Add an ID and I'll agree with you.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.9704, -3.168
OS grid ref: SJ216420