two copulating Downlooker Snipe flies, Female above, male below. No pun intended.
No interactions present.
Strictly speaking, you could not rule out R. strigosus, though that is known only from a relatively small area of the North Downs and nearby in the South-East.
My Flickr photos...
Lat/Lng: 54.4467, -1.1066
OS grid ref: NZ580060