Bumble bee colonies are fairly small, about 400 individuals. The males, as with honeybees, cannot sting. The females *can* sting but aren't aggressive, they only sting as a last resort. We think the coloiny will be there for a few months before the new Queens all fly off to find somewhere to overwinter.
I don't mind them using the incinerator bin, we don't use it that often. The bin isn't in the best place (from our point of view, that is), as it's right in the middle of the area where we keep the compost bins. We may try moving it a bit towards the fence later, at night when the bees are all home.
