I forgot about this thread.
I haven't done to much shooting at that property since she complained, mainly due to being far too busy and what I have done has been with my silenced 22. But I hope to get out and use my 17hmr again this summer.
That was also the impression I got Boulderman, I also have since learned that the AO made mention to my friends the farm owners that it wasn't his job to deal with stupid neighbourly disputes, hence wasn't interested in telling me off.
I'm certainly not going to go out of my way to annoy her, but I wont let her stop me shooting either.