Very small, approx half the size of a house fly, found in reeds whilst watching Dragon Flys.
No interactions present.
Looks like a yellow dung fly to me - Scathophaga sp.
This is very likely to be Scathophaga stercoraria, the Yellow Dung Fly, which has dark antennae (most, but not all, the related species have yellowish antennae).
Entomologist and biological recorder
Lat/Lng: 51.3, -2.0
OS grid ref: SU0259