Three days later I actually found E.nivalis (s.s.) and today discovered that the recording scheme has no prior knowledge of any E.intermedia in Scotland. Hoorah! It extends the range north for the species only by a few 10s of miles.
Here are the two side by side to compare abdominal patterns
|E.intermedia - bold but unconnected bar at bottom of "U"|
|E.nivalis - two "golf tees", no bridge, bottom bar faint|