Posted: 21/06/2014 at 16:45
Speaking as a member of a farming family - I would reiterate the point that most farmers are reasonable people trying to make a living and the lives of hill farmers are not easy.
Most would not want to cause problems for their neighbours, and will also be concerned to keep their valuable cattle safe.
You could point out in a worried and concerned way that you grow some plants in your garden that can be toxic to cattle (do you have yew or a laurel perhaps?) and while you've planted them well away from the boundary wall, you're worried that when the cattle get into your garden they could eat them and be very ill or die.
No farmer is going to want expensive vet's bills - the vet will cost him much more than securing the field boundary.