The problem with Studland is that it is so popular. That's why they have to attempt to control things, otherwise the place becomes overrun. It may not be popular with some interest groups but it has to be done.
It's quite likely that the letter you've had was designed to say exactly what you have read into it. (i.e. "**ss off"; but they can't put it like that!) They don't agree with you, and they don't want to spend more time on the matter. Sorry, but in some ways I can understand their position.