I had not realised that there was no requirement to check a break back trap set for rats daily. That does sound like the best solution.
That doesn't surprise me.
The BASC etc all produce 'Best Practice Guidelines' that often wrongly state that spring traps have to be checked daily.
Only if they are set for rabbits or hares do they have to be checked daily.
Break back traps are specifically exempted from the Spring Trap Approval Orders as well
providing they are set for rats, mice or moles.
Excuse what maybe a silly question, but would a unbaited run through set for mice work? (Using a mouse trap and smaller access holes).
Yes, and there are plastic bait boxes specifically produced for the purpose (AF Snapper is one). One point to consider is that whilst rats are naturally cautious, mice are inquisitive....
In reality, if you have mice indoors, then kill them and proof them out. If you have mice outdoors, it's unlikely they are housemice and there is a good chance they are Apedemus Spp (Fieldmice, Woodmice etc) which are not only harmless, but also important food for raptors.
A runthrough set up for rats costs very little and is easy to set up and effective: