We are 8 months into sorting our problem - with a professional contractor and the council involved.
We managed to contain the activity to under the floorboards and the attic quite early on, and poison has helped the reduce the activity.
Nothing ever died within the confines of the house, which showed they were living elsewhere.
You have the track down where they are coming from, or they will be back. This is what has to taken the time in our house, as this hasn’t been obvious - and we have had drain survey, and the council has been working in external cause.
They are dirty animals, that carry disease, and can make you very poorly. They can chew through wires and cause problems with your electrics.
We live in a terrace - turns out our neighbours had problems, but people were a bit embarrassed to talk about it - the council have been good in bringing us all together.
If you have neighbours, this could also be a problem for them. If the council comes in and finds that your property is the problem, they will serve an enforcement notice, and you could end up in court. Please take this problem much more seriously than you are