I have started a job in Standish, Wigan for noises in the loft which turns out to be Rats. I have put a treatment in place (i.e. baited the loft, and under the bath). I have surveyed along the terrace of houses and located a fault on one soil pipe.
The rats have tunneled out of the ground, up the side of the soil stack. This will require digging out and repairing any drain fault found and then concreting.
I also inspected the manhole chambers in the garden and found several fresh rat droppings in each drain as shown in the picture
The work is ongoing.