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it's not this, the wing venation is all wrong, but I don't know what else has dark wings like this
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Thank you Ophrys. C. variabilis has somewhat darkened wings and a hairy face, although I'm not sure this has a sufficiently elongated abdomen for this species, and I am more than happy to settle for Cheilosia, a very useful ID for me!
Thanks Jeremy for emphasising the venation, so important for me to look carefully at this!
Lat/Lng: 51.3826, 0.4635
OS grid ref: TQ715677