I watched these insects in my Suffolk garden this afternoon, and would be delighted if anyone can tell me what is going on. Is this a hoverfly nest, please? (Update, I now know it isn't.) I know very little about hoverflies.
Update: many thanks to Crafty Green Poet for informing me that these are not hoverflies. Please see her comment.
P.S. You can find my butterfly-related #30DaysWild post for Day 20 here.
