Members of the public, whether parishioners or not, are entitled to have a copy of any document the councillors will be discussing three days before the meeting. All County Councils do it, all District Councils do it, but there are still far too many Town and Parish Councils hiding their deliberations. There really is no excuse. The agenda must explain the nature of the discussion, not just the topic, and all supporting documentation must be in the public domain, apart from the very occasional exceptions, for which the public and press will be excluded from the meeting (some confidential employment issues, legal matters, contracts for major works etc). In an ordinary parish council, these are so rare that many clerks never experience them.
It is for this reason that councils should not have Any Other Business on the agenda, as prior notification cannot be provided and also that they should be wary of making decisions in relation to matters raised by parishioners under their Public Forum agenda item, which some councils schedule before the start of the meeting so that it doesn't form part of the official business.