Fly with clear-wings with black spots, long black abdomen ending in orange.
No interactions present.
I think it is a female scorpion fly
Sorry Ben, I have only just noticed your comment on scrolling down the page. In future rather than adding a comment have a go at adding an ID.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.3641, -2.6165
OS grid ref: ST571629