Is there any case law that supports the argument that the UDI has public interest standing?

The Respondent relies on Bates v. Delta (District), [1983] B.C.J. 980 (S.C.) for the proposition that an umbrella organization does not necessarily have public interest standing merely because it represents parties who are directly affected. Further, the Respondent contends that in these circumstances it is particularly inappropriate to grant standing to such an umbrella organization as the UDI because the declaration sought will not be binding on the UDI given that the Bylaw never directly affected it in the first place. They argue that the UDI’s motion is “moot or something in the air” and that it would be more appropriate for those directly affected by the Bylaw and, thus bound by the declaration, to bring the action.