On the bushes beside the path through the woods near the ice house, I came across this slightly unusual looking Dolichopodid fly. It has large red eyes and a whitish abdomen (which is more noticable from above, through the wings). It is a member of the genus Argyra (Diptera: Dolichopodidae), possibly Argyra argyria, but I am not sure about that. [Note added 2013-06-20: there are 10 other Argyra species on the UK checklist.]
Photo taken in Whiteknights Park, Reading, UK, on 2009-07-21.