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I think I see a dark stigma towards the rear, outer edge of each wing. The Spotted Crane-fly (N. appendiculata) has only weak ones. I have been using the term "Tiger Cranefly"
as a common name for members of the Nephrotoma genus - or at least some of them.
Lat/Lng: 51.9875, 1.1258
OS grid ref: TM147367