The Lady reckons she saw one on the kitchen floor yesterday. I got a torch and had a look around under the units (they're on legs, which is so impractical - so much dirt and crap gets under there) and couldn't see any holes but did see some stuff that could be droppings. It's an old building with various faults, so even on the third floor I'm not that surprised they can find a way up.

Anyway, rather than wait to see if nibble holes start appearing in our food, I'm going to be proactive and try and take it out. So here are the options:

1. Classic cartoon-style mousetrap

Pros: Retro styling for hipster value, cheaply available from hardware store next door, you know for sure it's worked
Cons: Killing a mouse isn't very nice... but I think I'm reconciled to that. Might be a bit nasty to clear up, but I'll get over it. Only does one at a time

2. Those humane trap box things

Pros: No death. Can get more than one in there. Probably not too pricy
Cons: Can't be arsed to walk down to the park to let them go. What if they go in another house and eat a baby or something?

3. Poison

Pros: Simple and effective. Can take out ALL OF THE MICE.
Cons: As I recently discovered while on holiday, if a mouse eats some poison then carks it in a hard to reach spot, it will sit there and rot and make the most unholy stink. Can't be having that.

4. Do nothing

Pros: I'm lazy, so this appeals.
Cons: Could soon wake up to find a nest of rabid vermin chewing my knob off.

How have you dealt with infestations? What would you recommend here?