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One for John Carr, perhaps?

Quite a big one, had thought it was a female Bibionid at a glance because of size, shape and colouring. A similarly structured fly was recently identified as a Mycetophilid in a thread, so although I had thought they were smaller and less colourful...

Anyway - Location: CHongwe, Lusaka, Zambia.
Habitat: scrubby grassland adjacent to gardens/orchards. If I recall correctly, on a stand of invasive Mexican daisy.
Date: 28 February 2013.
Size: Reasonable sized, probably around 10mm long.

I'll appreciate any and all progress on ID because frankly, I haven't a clue.

EDIT - title updated from 'Nematoceran - Mycetophilidae?', to 'Sciaridae?' based on post by John Carr.
EDIT - title updated to 'Sciaridae, Zambia' based on post by xylo.