this might sound silly but i got a bit o permision with going to farms with terriers and asking if they had rat problems while lamping the rats at night i would shine across the fields if there were bunnies about i would gradualy ask if there was any chance of a bit o ferreting leading to a bit lamping with the lurchers if he sees your doing a job with the rats he owes you a favour build a friend ship with him and pop question 9 times out o 10 its not a problem but you might not have terriers ?