General records of the Government Code and Cypher SchoolHW 11940-1945Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence
This series contains summaries of selected signals intelligence reports, issued by the Government Code and Cypher School and sent by the head of M16 ("C") to the Prime Minister (or, in his absence, the Deputy Prime Minister or the Lord Privy Seal) in batches several times each day during the Second World War (using the code name BONIFACE), with associated correspondence.
The documents comprise the original cover notes and actual documents passed on, complete with annotations and minuting.
Each file usually has three main elements, in addition to the cover note from the head of the Secret Intelligence Service and included associated correspondence and some intelligence reports from other sources:
Items CX/FJ, CX/JQ or CX/MSS: reports relating to enemy ground and air forces in Europe and derived from high grade cyphers such as ENIGMA;
Naval headlines: summaries of Spanish, German and Italian naval activity;
BJ reports: selected translations of intercepted diplomatic telegrams.