Is this a pair of robber flies? It looks like they've caught something...
No interactions present.
This is a pair of empid flies. The male captures a food item (probably another fly) and presents it to the female as part of the courtship process. She then feeds on it while they mate.
Thanks for the interesting info, David!
Lat/Lng: 52.7, 0.3
OS grid ref: TF5820