I would agree that the best thing to do is use NALC templates and customise them to your needs.
eg, if the NALC template refers to a staffing committee, but you have a personnell committee, then just change that wording.
Some NALC Templates leave a fair amount of wriggle room enabling you to modify it to fit your organisation, the complaints procedure being a key one. My other opinion is that SLCC templates can be looked at, but of the few I have seen (served up as best practice) none were suitable, and more a clerks doc that one for the public and councillors to follow.