Stoke-on-Trent City Council released detailed documents from its own internal investigation on Monday, following a Freedom of Information request by the BBC.
The internal email, which came to light following a Freedom of Information request, was sent as part of South Yorkshire Police's preparations for the publication of the Hillsborough Independent Panel report last year.
Minutes from an internal Ministry of Defence committee - released as part of a Freedom of Information request - note a discussion on the interpretation of the OSPAR convention on waste dumping.