Mark,
I don't accept that I am wrong. Leaving aside your assertion that "those that print the RDAA book and website are ignorant", my original comment was specifically regarding your analogy of calling The Several Fishery - Severals with that of calling the Queen - Queens. I still believe, and maintain, that this is an inappropriate and incorrect analogy. I do not know a single person who refers to the Queen as Queens, and yet I know many who refer to the section of river in question as "Severals".
While I have no intention of disputing the derivation of the given name of the "Several" fishery, I do wonder, that aside, how far are you prepared to take your "makes no sense" argument?
In the eleventh century Ringwood was called "Rincevede". Following your logic, either everyone who now calls Ringwood Ringwood is ignorant, or else the name Ringwood has been accepted into common parlance. Otherwise, calling it Ringwood would make "no sense in any way whatsoever". I would suggest that the name "Severals" has now been similarly accepted by all, except you.
To my mind, for clarification, calling the Several Fishery "Severals" is in no way similar to calling The Queen - Queens.
Surely, in a modern day environment such as an internet forum, someone asking for advice on angling opportunities in the area should be advised of suitable stretches with reference to the common parlance of the day?