This tiny 'fly' is really only about 3mm long! - excluding antenna.
No interactions present.
If so, probably Dictyonota strichnocera.
The similar Dictyonota fuliginosa has mostly brown antennae and Kalama tricornis has hairy antennae.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Great! Thanks to you all for all the info...
Lat/Lng: 50.728508, -1.752033
OS grid ref: SZ175921
In grassy habitat adjoining marsh