Richard,
I have a nest of (smallish wasp looking insects) in my cranebill patch, they are strippy yellow and black and I think they are nesting in the ground. I have noticed when I approach the nest a group fly out in formation. I work around them, but I want to cut back the crane bill and tidy the area a bit. But I don't want to disturb them. Kate thought they might be bumblebees. I have had wasp nests, these are smaller, and I have become quite attached to them. I would love to know what they are, I cant do photos yet, I am new to this technology!!! Very new!!