Ian, there is something else that you need to realize. Some people may be blinded by the words top secret and assume things. Example: I have been in a state archives and their list of firearm carry permit holders was classified as top secret. Why? Because such a list could "finger" undercover law enforcement operatives, just as a start. The TS classification can be for many reasons, some of which may not be obvious at first glance. For example: facts in a report may not be critical, but the report information saying that the information was obtained by John Smith working as an agent of X agency in an undercover operation of subject Johnny Jones.