An investigation into alleged confidentiality breaches at Wellington City Council hasn't been able to find the leaker.

Lawyer Linda Clark has been looking into the conduct of five independent city councillors after a complaint from Deputy Mayor Laurie Foon.

The code of conduct complaints alleged councillors had leaked information about a publicly-excluded meeting about the fate of the Reading Cinema site.

Wellington City Councillor Nicola Young is among the five councillors accused of breaching confidentiality rules- but denies violating the code.

"The code of conduct is very vague- I don't accept that I broke the code of conduct, none of us did. It's extraordinary to take this action against a third of the councillors."

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