cheers for the advice folks ive got the dvd, but i lent it to my mate after only watching it once so ill get it back and study it, i did wonder why more rats didnt bolt, i suspected some may be dying under ground as the holes were well used. And when i put the smoker in i just put it full blast so i must have put it on too much as the one rat that did bolt, bolted at the start.
I did wonder about digging them but as it was on a sileage pit i didnt like to as the farmer may have been unhappy, ill wait till ive been a few more times, but at the last farm it will be a real possibility as ther