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I see what you mean about the venation. I think what threw me was what I thought to be ocelli immediately behind the compound eye ( best seen in photo 2) which is obviously something totally different!
This looks good for Mycetophilidae to me, and I think there are ocelli on the head! Further opinions welcome!
Entomologist and biological recorder
Lat/Lng: 51.3085, -0.1801
OS grid ref: TQ269581