the thirty-year rule
noun/ðə ˌθɜːti ˈjɪə ruːl/, /ðə ˌθɜːti ˈjɜː ruːl/
/ðə ˌθɜːrti ˈjɪr ruːl/
[singular]- a British government rule which prevented certain official documents from being made public until a period of thirty years had passed. It was replaced when the Freedom of Information Act was passed in 2005.
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the thirty-year rule