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Found high on a garden fence running along a dark damp alley with various overhanging trees leading to woodland which gets little sun in south east England.

From what I can see of the wing veins there does appear to be a forked vein similar to that found in Sciaridae. The wing is dark and the shape also suggest to me possible Sciaridae but other than that cannot find anything to compare it to.

I'd be grateful for any suggestions.
Gordon