Im not sure , yet in the past, i have found mouse droppings on the top stair! So i assume, naturally, that they must have been making their way up to my bedroom . I have found the Southwark Pest Control Team to be verging on useless . All they do is repeat the failed process. To put down poison ( when they show up). This doesn't get rid of the mice for long, as they come back again . Then they mouse proof the area they suspect the mice are coming from, yet the mice still appear . I even got the feeling the guy from Southwarks finest quite enjoyed the drama of it all, ( smiling, leaving a hysterical woman on a Friday afternoon).