Peppered Small Comb-horn Rhipidia maculata
I wasn't quite sure if I was reading the antennal characters correctly when trying to identify this, but in the end the wing pattern seems to be pretty unique. The wing was 8.2mm long.
, Gorgate, 14-Jul-24 (A) (1).jpg)
, Gorgate, 14-Jul-24 (A) (2).jpg)
Peppered Small Comb-horn Rhipidia maculata showing wing, Wendling Beck Environment Project (Norfolk, UK), 14th July 2024