There is apparently a bees' nest in the top of a disused chimney on my roof. The builder offered to give me details of an exterminator, but why would I need to kill them? It's been up there for some time without bothering us. It is outside DD's room so there is a risk of them coming in the window, but it's set not to open far, and I have no problem with escorting them out again. WIBU to live and let live? Bees are great.