We had mice about 2 months ago, behind the kickboard under the sink, scutter scutter, scratchy scratchy, even heard a bit of knawing, probaby on dishwasher cable - bought 2 of those cheapie wooden traps for e1.25 each in the local hardware shop. Got 1 of the mice in two days, the next one after another couple of days. One baited with Jaffa Cake, other with Cheese Sambo. End of mouse problem. We have a cat, have had her since 1995 - fat load of good she was... I've left the traps where they were. Didn't like poison traps - worried about the agonising pain for the little mouse, not to mention other animals eating it or the kids finding it...The two mice were a good 8cm long (incl tail).