There were dozens of the brown moths flying around but it was proving impossible to get a good image amongst the grass stems. Then, when I eventually had one posing brilliantly in front of my lens, this robber fly jumped on it before I could press the shutter! Lovely creatures these, they stick their proboscis into the unfortunate victim and suck them dry.
Insight into Dysmachus trigonus: about 15mm long with particulary bristly white tufts around the head and at the rear of the thorax. It flies between May and August throughout most of the UK favouring sandy habitats.
Reference: Collions Complete Guide to British Insects