I saw a programme about an American company who managed to trap bees out. Basically they constructed a cone over the entrance to the nest so that the bees could only leave the nest and right next to it they put a hive and put some cotton wool soaked with lemongrass into it. The bees ended up going into the empty hive and once enough of the workers had left the Queen left as well. I would like to try it, it did take about 3 weeks though.
As per the previous posts, I have found a lot of customers completely unwilling to go through the process if it's going to be a long job. And that's not