How about having a fixed rate which any boat on BW water pays (like the current licence fee, but possibly less). This entitles you to keep your boat on BW water as long as you keep within the moorings rules (e.g. 14 day maximum stay at any point or 48 hrs at a visitor mooring or whatever).
Then also have tolls to be paid when a boat moves and uses the system. I think this would be fair as a boat which does not move does not contribute to the wear and tear of movable bridges, locks etc. as much as a moving boat does. The fixed rate could be changed so that different types/lengths/etc. of boat pay more or less depending on the ulterior motives of BW at the time. Cheers, Ben
