LOL@Mary
We had a real issue with mice just after we bought our house in Aberdeenshire. It wasn't just a seasonal thing either and no end of traps would seem to ever make a dent in their numbers. Having 2 cats also made us think twice with using poison. I was desperate when one night while watching a nature program on TV I saw predators marking their territory and the scavengers moving away to pastures new. I thought "what the hell, I had nothing to lose!" so for two weeks, every time I needed a pee I went outside and pee'd along the back of the house and around potential areas where they could get in. I also peed around our outbuildings and sheds.
I kid you not it damn well worked! After a week there was a noticeable difference. The traps caught less mice and there was less scampering and gnawing noises. After 2 weeks they were gone! Not a mouse!
Right up until I left the house 6 months ago I would go out once every few weeks and pee along the back wall at the access points. We were never bothered by mice again. If somebody had told me to do that I would have laughed at them and told them where to go.
Give it a go, I'm serious, it worked for me!
EDIT: Oh yeah but don't tell your neighbours as you tend to get a good ribbing about it....often!