For a moment I glimpsed the brilliant indigo of a Banded Demoiselle (Calopteryx splendens), just near Gunnersbury Triangle’s picnic meadow. It was the very first sighting of that species in the reserve: a bit surprising, as it’s a species of slow-flowing rivers. It does occasionally frequent lakes, so perhaps there’s a population near the artificial waterfall over in Chiswick Business Park? I’d better go and have a look!