From a link from a poster on this site, I heard that peepermint or eucalyptus oil may put off the mice. If I knew how to post a link (help, anyone pls!) I would send you there. But In essence, it said that to keep mice out of your house, place pads of cotton wool or rags soaked in peppermint or eucalyptus oil around the entry points to keep them out.
I went a few steps further, as the crafty b------s avoid even the traps that I set with the strawbs they're after. It may seem extreme, and a lot o faf, but I have lifted my fruiting runners and tied them to small (orchid type) canes. They are now above the ground so (hopefully out of the reach of slugs, who prefer the brassicas anyway at the moment) But I used natural twine below each lowest fruit, (and then to support the highest fruit), but I soaked all of the canes and All of the ties in peppermint oil. I have since watched the little blighters, and they want to get that strawberry that they had already had a chew at. (the ripest!) But it seems they are not as keen to get there, and keep jumping off the canes before they get near the fruit. I have yet to discover how long the peppermint scent lasts (1 wk so far to my sense of smell), and whether the mice will get used to it. I think that the thin canes are too narrow for the big fat slugs I keep finding (and feeding to the wild birds and mt ferrets) but maybe small slugs coulg get up there. So far they haven't, but I'll keep you posted.

I currently have 5 fruits nearly ready to pick. before this experiment, they would have been gone before they were ready. The ripest fruit that they have already nibbled, and would normally have gone by now, they don't seem to want.. I will let you know whether this works within the next fortnight, but so far, it finally looks as tho we will get some strawbs ourselves. At last!