Longish post, but only because you repeated yourself a few times. Barrack room lawyers are rarely fully correct. But my point was, if they don't want us, we shouldn't stop! And lets be honest here, the reason they were asking about the legality of the sign, so they know whether it is safe to ignore this and others like it.
We have enough of a bad image, why strive to make it worse and bring in stronger measures. Just because you can, doesn't mean you should! And "stick from us"? You go for it!
But I stand by my first post.
"But the rights and wrongs of the sign shouldn't come into it! If they don't want overnighting there and it continues, up will go barriers or some other sanction. Then we won't be able to park and visit for the day!"