Our dispute with Langstone is the stuff of legends, took years of legal wrangling and although (perhaps on paper) we DID prevail, its essential to remember that areas such as this are a miriade of complex environments, ALL with different but sometimes self serving mutual back up attitudes. Mud flats, RSPB reserves, SSSIs all within yards of your craft. If one stake holder feels "threatened" and nowadays this NO longer requires a threat--- these groups can simply state they "feel" threatened--then "they" have a confidential "chat" and slowly all come to the same conclusion that--- "We prefer to NOT allow hovercraft".
It may theoretically not be "strictly lawful" for them to lay down such absolutes, but in modern life it seems if "AUTHORITY" is claimed with sufficient strength, (especially if they take on the mantle of "Captain" ), then its usually sensible to launch elsewhere as John suggests!
Its SO easy to operate (a hovercraft) where you can for free, rather than operate where everyone else congregates, because they HAVE to?
Slip ways are nearly always crowded and want paying!
Once you have found a quiet place to park up, and slowly prepare to operate, leaving your trailer connected, returning to an open shore, hover up and have a coffee, then off again,,,, you will learn to celebrate the differences (advantages) of hovercraft ownership.
Similarly some people consider craning their craft onto the trailer--- no just hover it on- its a movable vehicle, (or should be)!
Best to tag along with some of us (as suggested here) and celebrate our differences from the ordinary, rather than waste time persuading closed minds that "we are similar"
Im glad we aren't!
Good luck