From August 2008: a Sciomyzid fly (Diptera: Sciomyzidae). I am unable to identify the genus and species, at the present, at least. [Note added 2011-05-16: this looks to be the same species as the one here which I identified as Limnia unguicornis.]
This is the same fly from the other side:
Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2008-08-30.