There is no lawful basis to automatically exclude any body from attending any Council meeting. Exclusion for anybody from ANY council meeting can only be lawfully applied by reference to Schedule 12 of the 1972 LG Act. and a resolution may be required. And people can still attend the meeting for items that are not deemed exempt or confidential.
If the agenda for the next meeting does not state that members of the press and public are excluded,, simply turn up to the next one and if you are refused entry,inform them that the exclusion is unlawful, as it is not indicated on the agenda.
If the agenda says that an exclusion applies, ask the Clerk why. Ask on what basis with respect to schedule 12 for ANY of the agenda items was a resolution to exclude given, or the record of justification for exclusion was minuted. If they can't provide an answer their exclusion is unlawful.