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This specimen appeared in my kitchen on 25/01/2013, presumably trying to escape from the Arctic weather we've been having in the UK lately!

I know it's asking a hell of a lot to identify this from a photo, but the accompanying data should provide some clues to those in the know.

Location: UK, OS Grid Reference SJ491852
Date: 25/01/2013. Specimen observed clinging to back door in the kitchen at around 03:00 GMT. (Yes, I sometimes keep strange hours!)

Specimen body length is no more than 10 mm.

One possibility that arises, is that this could be a species with an aquatic larva, that has somehow managed to escape being detected by the tropical fish in my fish tanks, and emerged as an adult after surviving being hunted down by my usually ravenous fish. Of course, I could be way off base here, but that thought has crossed my mind, and would explain the rampantly unseasonal appearance of this insect. :)

But of course, there are people here who know better than I about this, hence this post.

Over to the knowledgeable dipterists ...