No interactions present.
I thought this was E.tenax because of the look of the black stripe on the face and pattern of yellow on front legs.
I believe this is a diagnostic feature but I'm a novice in hoverflies.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.1277, -2.3261
OS grid ref: SO777477