Unknown fly or wasp attacking a fly

Unknown fly or wasp attacking a fly

Observation - Unknown fly or wasp attacking a fly - Global. Description: A pair of what at first appeared to be fighting flies on a track between high hedges on the edge of farm land. The upper insect has me baffled as after many searches I haven't been able to find any matches.

A pair of what at first appeared to be fighting flies on a track between high hedges on the edge of farm land. The upper insect has me baffled as after many searches I haven't been able to find any matches.