Disconcerting to take a kitchen utensil out of the drawer and find it mouse-nibbled. Slightly more concerting to remember using the utensil within the last week and it was fine - so whenever the incursion happened, it was recent.
But even so ...
Traps were purchased and set last night. This morning the traps were still there and the bait gone. Round 1 to them. Today we purchase foam to seal up the likely point of ingress (a patch of wainscoat that seems to have been removed when the sink unit was fitted) and we reset the traps. And wait.
"Humane!" pleaded our neighbour when she heard about this. Humane, pah. She was talking to a Swedish farmer's daughter. Where Best Beloved comes from, the nice warm farmhouses at this time of year are under siege from a field of gray undulating across the landscape. You look out into the yard and you can see the mice building trebuchets and assault towers. They know this is a no-prisoners battle. Humane??
Anyway, the woman offered us the use of her cats. She wants humane, and so she hires out her furry Gestapolings? Traps are a lot more humane than anything a cat can offer.