A dance or Dagger Fly
No interactions present.
Haviing looked Ian again I think you are correct although there are only two other opaca on i-spot (at the minute)neither showing the thoracic striping there is a good comparitve thread here
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How nice to find the diptera link in WlR's comment. Anyone reserarching these flies would do well to go through Other Observations.
I am preparing for my own E.livida
Lat/Lng: 53.694, -1.81072
OS grid ref: SE125219