A precedent book is a document recording procedural, legal or constitutional precedents. Such a book may have significant constitutional effects, such as the UK's ''Precedent Book'' (or ''Rule book''), written by the

Cabinet Office The Cabinet Office is a department of His Majesty's Government responsible for supporting the prime minister and Cabinet. It is composed of various units that support Cabinet committees and which co-ordinate the delivery of government objecti ...

since 1977. Its archive files are subject to 30-year closure, unless otherwise stated.The National Archives' catalogue, CAB - Records of the Cabinet Office, ''Cabinet Office: Precedent Books''

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