I had a mooring on Fortuna Dock for several years. Excellent, no problems.
I'm not too sure of the question you are asking. Unless you are referring to moorings above the railway bridge, these are generally always available and I did consider one. What put me off is the access to the mooring, unless its at the top of the tide you have to negotiate river mud. It will be impossible to keep the boat clean. Also the dinghy park, below the railings, is very exposed to vandalism. I decided it was too much money for too little benefit.
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