Hi Pippi,
We had booked Rentokil to come out on Tuesday, but then I talked to an ex-employee who advised that he thought it might be a waste of money as they would not help my particular situation (which is finding out how they are getting in).
We got a friend who does final checks on new houses in the building trade to give the house the once over and spot any defects / entry points for the mice. He spotted two very wide holes at the front door (drain just outside front door for water run off). These were at ours and neighbours house. He also found a few more holes on the outside in the neighbours house which he said they could get in on ground level.
Therefore I think this has been worth a lot more than what Rentokil would have done. We were told that they would come out and put down something (gel) in certain areas so that they could track where the mice were coming in. Then they would come back a while later and sort that out (fill up the area / advise where should be filled). They would also put down poison in the house and areas they think the mice might be to get rid.
But we have traps down all over the house and have poison outside the house (and I think anyone can do that).
Three days after finding the first one and we are mouse free, after blocking up the other points of entry. I still think there may be one or two in the attic, but we'll get them too if they are there.
My main concern which I feel more confident about is that we have stopped them coming in. However in a semi-d if the neighbour leaves the back door open (which she is prone to doing) that will let them get into her house and from there they can get into her attic and then our house, don't know whether this is your problem?
Hope this helps - rentokil were going to charge us €240. From talking to the ex-employee, it is about call volume and not necessarily about finding the mice!
All the best.
