Looks like it might be a Daubenton’s bat. They’re starting to settle into hibernation now the weather has turned colder.

It’s swarming season, where bats head to underground sites to mate. Particularly Myotis species, with Natterer’s swarming well into October. Did you notice if the had white ‘belly’ hair, in contrast to their brown backs? They’ll be quite active for a while yet.