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If you know where they're coming in then plug the gap with some wire wool.
6 years on I can confirm this only works for a few months - they have chewed through the wall next to it. GF spotted one yesterday morning. Two traps overnight both caught mice.
A buddy says to supplement the wire wool with expanding foam filler. Hopefully that'll sort it for good.
If you know where they're coming in then plug the gap with some wire wool.