Pc Plod are you a real police man by the way?Would have thought farmers would trust a policeman and let you on no problem,you would have an advantage over the rest of us hunters,not having a knock at you or anything,but my advice is you have to knock on doors like the rest of us and gain the trust of the landowner/farmer as there is no other way,except perhaps by way of friends recommedations and invites until you are trusted,then word of mouth will do the rest,good luck finding permission anyway
Higgins