Posted by Toby on 29-03-2011 21:28
#1
in Richmond Park, SW London:

Posted by Juergen Peters on 29-03-2011 21:42
#2
Hello, Toby!
I am no expert, but I think it is
Tachypeza nubila, Hybotidae (they are abundant here at trees, too).
Posted by Toby on 29-03-2011 23:27
#3
thanks, that looks right. I wouldn't have guessed at Dance fly.