The past couple of days, it sounds like we have rats in the void between the downstairs ceiling and the upstairs floor. The cat is at alert and a little hole (about half the size of a pencil) has formed in the middle of the living room ceiling. I don't know where to start with this one. We had works to extend the kitchen a couple of years ago and I think they most have got in through the disturbed drains. I did find a rat in the kitchen soon after and went to war with traps and sealing any holes, it seemed to have done the trick.
This time they are in a place that is not accessible. The noise can be horrendous when they are moving about. Any ideas anyone?