Carbon Dioxide is not poisonous, it just does not suport life - the poor beasties suffocate. Cruel Rentokill!!

I still advocate the hair trigger metal snap trap. Baited with a chunk of Twix bar wired in place one trap has been known to get seven or eight mice in one evening. They can be washed off, unlike the wooden ones which absorb bloodstains.

For the last few months we have not seen any mice, but a neighbour reported seeing a rat in their garden, so maybe they have eaten the mice. I just hope there is nowhere the rats can get into the house.

Anne