Over the last few weeks I've noticed we seem to be bucking the trend of a reducing bee population and have had more than the odd bee in our living room. Then, when I was sitting in the garden yesterday, I noticed them coming in and out of a vent which is near the ground and the outside of our living room wall. My husband thinks they must have a nest (hive!?!) under our living room floor, based on the position of this air vent, which means potentially they could be under most of the downstairs flooring as the joists run the length of the house. Has any one got any idea of what (if anything) we should do about this? The bees themselves don't bother me but I'm not sure if they might be doing any structural damage or anything - any one experienced this??