Smoke um out and have a terrrier (or few) around to catch them, the ones that dont bolt either die from the smoke fumes or get dug out
We have 5 fab ratting terriers, of which 2 are great markers so ya no if there any still left down then we dig them out! We take them ratting most weekends all thru winter for a lot of the local farmers in ryedale
If i lived near by i glady come help you out but were not sorry, if ya ask about near you there will be some keen ratters awaiting some work
Danielle