Excellent reply Phantom, The pheasant season will be here soon, so offer your services beating and you will get to know landowners and the keepers on shoot days then ask them about a bit vermin control with the air rifle, if they say yes but after the seasons finished then it will be a foot in the door. Once you get your first bit of permission make sure you do a good job and the farmer see's you regularly as he will tell his friends about you when they mention vermin problems. Good luck and don't give up