A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following reports on West Europe: of German Air Force (GAF) operational orders, for March 8; of 22 aircraft being destroyed and 10 damaged in attacks on GAF Roehrensee, on February 25 and 27; and of GAF measures to recover armour plates, on March 7; Naval Headlines; from the Mexican ambassador in Moscow, on the Spanish problem being discussed at Yalta, on February 21; from the Portuguese minister in Cape Town, on public acceptance of the British government's position, including that on Poland, on March 5; and T482/16 (see 8773).