Another pic added of a side view. Didnt think I had any others with acceptable focus.
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Could be in genus Mycomya, looks very similar to these American examples:
Entomologist and biological recorder
Thanks Martin, do they feed on fungus? It was found in a manky damp bit of woodland floor behind a wall where people had been dumping rubbish, there was a puffball there but Im sure lots of fungi. Many places I hop walls to get into woods I seem to find sneaky illegal dumping. Walls seem to attract garbage.
According to the RES key by Hutson, Ackland and Kidd, this group of fungus gnats have larvae that are thought to develop in rotting wood (probably feeding on fungi therein), under bark or in (Basidiomycete) fungi. The larvae spin webs and may live communally in at least some species. But of course like many invertebrates the life-histories are not fully known, and indeed for particular species may be entirely unknown.
I caught one of these fungus gnats as it had just come out of its larval case on 14th February 2013. At first I thought it was a Phantom Cranefly but checking the wing venation I see that it is of genus Mycomya. I collected , but did not preserve, the larval case and the gnat. I still have them. The larval case and the fungus gnat was on some strands of white fungus on rotting wood leaning against the back of my wooden garden shed. When I caught the gnat it was still white but soon developed its proper colour.
Lat/Lng: 55.0357, -5.9693
OS grid ref: NW464784