EEK
For a while I have heard scratching noises in the bedroom wall and running across the attic - finally had pest control come out and check the attic. They confirm it is rats and that they accessing the property via the drain in the garden.
Anyone been through this who can provide advice on the best course of action - I am not sure whether we need to simply block up the drain or need to get specialists in to carry out a CCTV drainage check.