I have noticed that in the last week bees are coming and going through a grill under the eaves that allows an air flow in the loft. I have been up in the loft to see if I could see what they are doing and nothing is visible. Are they treating our loft as a 'hive'? I do not want to disturb them and am happy to let them do their own thing, but I am just curious. Has anyone else experienced 'bees in the loft'?