I live "up north", actually in North Lincolnshire and these flies are extremely numerous at this time of year. This year has been the first time I have actually noticed their very long proboscis/feeler/antenna/tongue, whatever it is. That could be because I have never been close enough to see it before. This one I caught on camera at Danes Hill Lakes near Retford, Notts but also caught more on camera at Clumber Park near Worksop, Notts. It certainly is a fascinating little insect. This first photo of a group was captured at Clumber Park, the second shot of an individual was captured at Danes Hill Lakes. If someone could help with ID, I would be very grateful.
Thanks Jonathan, I have looked through the examples and see what you mean. I am seeing all of those Adelidae and Nematopoginae moths showing two antenna. Unless I am missing something, these that I caught appear to have only one antenna. At least from my photos and observation, I only saw a single antenna. Looking more closely at one of my photos, I do see a tiny "fork" in the end of one of the antenna captured in the photo. They were not an easy subject to photograph I have to say!