A quick update.
An increasingly unpleasant smell in the garage prompted me to have a bit of a tidy this morning and I quickly found the decomposing body of a mouse. As I was dealing with it another one ran across the garage floor, prompting a nifty bit of spade work!
So apologies for implicating the squirrels, I have removed the squirrel trap and put down more mouse poison.
~iw
