Small (6mm) slender fly, small head, bulky thorax, some banding visible on abdomen, long legs. Trapped in spider's web. Trichocera sp. ?
No interactions present.
I don't think it is slender enough for Trichocera, and September is probably too early for them too. Possibly an empid in the broad sense.
Lat/Lng: 53.1, -3.1
OS grid ref: SJ2964