Rescue

Somebody today found a young bat inside the office, huddled next to an internal door. A phone call to the RSPCA produced advice: let it hang on a tea towel, take it outside and let it take off. They can't take off from the ground, apparently. Not sure if it has to be a tea towel.

I wonder if this means that bats have moved in to the building (which is only a couple of years old)? Do they like modern offices?