In article , "Andrew Chesters"
says...
Rob Morley wrote:

SNIP

If I had bats in the roof space I wouldn't do anything to disturb
them - they're protected by legislation anyway.

You would if you could. One or two sweet little fledemaus is one thing.
However, when the colony grows a bit, and the seek some lebensraum,
you will want to reach for the bat traps.

They will move into the cavities, and if there are gaps, your bedroom
too. Once in the house, as it is illegal to disturb them, you might as
well move out.

I don't have cavities. If they moved into the house I expect they'd
keep the cat entertained.