I don't know about your moral view on this but this stuff will wipe them all out sharpish... I got rid of a Rat infestation in our loft with this (be careful nothing else ingests it though)
https://www.diy.com/departments/deadfast-rodents-plus-rodenticide-pack-of-15/5023377005589_BQ.prd
The problem with poison is that they die somewhere (usually inaccessible) and then rot and stink for ages.
How many have you trapped? Whenever I have had problems I seem to stop catching after the 6th.
@johnnettles2 started
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I don't know about your moral view on this but this stuff will wipe them all out sharpish...
I got rid of a Rat infestation in our loft with this (be careful nothing else ingests it though)
https://www.diy.com/departments/deadfast-rodents-plus-rodenticide-pack-of-15/5023377005589_BQ.prd