Mice = total warfare.
Ensure doors, airbricks or any other potential points of ingress are properly sealed (you can put metal mesh behind airbricks) because they can squeeze through any hole you can poke a ballpoint pen through.
Poison, snap traps (bait them with chunks of jelly babies. The cleverer mice learn to nibble and lick other foodstuffs without setting the traps off.)
Never leave bread out and ensure kitchen floors are kept free of crumbs and other food particles especially in cavities under skirting boards.
We had a couple of 'visitors' a few years ago and it took almost a year before we accounted for them all. (We know we got 'em all because during a recent kitchen re-furb everything came out, plaster, units, floor, the lot and not one single meece corpse was found.)
One stoopid one found itself trapped in the kitchen bin and could not jump high enough to get out and another got trapped the same way in a large empty Special K box (they can't shimmy up the smooth plastic liners). We had to 'liberate' these in the local park because our youngest daughter found them both and she would not countenance meecey murder! (She even accompanied us in the car journey to the park to ensure there was no foul play.)
A couple more went up the hoover nozzle and local cats who use our garden as their lounging area took their toll.
The recent re-furb has taken care of any future ingress hopefully.
Rega P2
Ortofon 2M Red
Rega Fono-Mini
Arcam Solo-Mini
Rega R3 loudspeakers
Dell D630 notebook + iTunes
Firestone Audio Fubar II USB DAC (+ OPA2107AP op-amp)
Firestone Audio Supplier PSU
Chord interconnect and speaker cables
Tacima CS929