Is there any case law dealing with the issue of public interest standing?

The chambers judge erred in law, and this is a fatal flaw, in not addressing and resolving the issue of public interest standing. Public interest standing, on the one hand, and abuse of process or no reasonable cause of action, on the other, are closely linked and tend to merge. As explained by LeDain J in Finlay v. Canada:112 The issue of standing and reasonable cause of action are obviously closely related, and ... tend in a case such as this to merge. Indeed, I question whether there is a true issue of reasonable cause of action distinguishable, as an alternative issue from that of standing.... Clearly, if a plaintiff has the requisite standing an action will lie for a declaration that an administrative authority has acted without statutory authority.