Re: Burden
"I'm not sure how much paid for time should be spent on giving details of a local councils plans for handling zombie invasions."
The exact amount of paid for time that should be spent developing such plans. None.
It's easy - if the public paid for the time a job took to do, the public has the right to know exactly who did what, why, how, when and with whom. Small number of exceptions (physical threat to life / limb, national security - properly defined - etc). The rest? Publish it. All of it.