I personally would take a very dim view of such behaviour.
Not very nice and someone who'd never be trusted again.
I agree about it being the farmers decision but I've had farmers tell me that there's someone else who has detecting rights there
so they have an understanding of fairness and I understand and respect that attitude. If it was a free for all then there will be people
who just sit back and wait until permission has been acquired by someone then move in to feather their own nest so to speak, which also brings
up the aspect of behaviour and respecting the land 'you' have gained permission for.
I agree but if i were to poach land (which i would not) i would not tell anyone i would play dumb and say that i didnt know anyone else had permission and as im here asking and the land owner says yes then i may as well.
Then as far as anyone else knows i accidentally poached it.
Sounds like i'm experienced poacher.
only with eggs promise.