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 correspondence: a message from C to the Lord Privy Seal (LPS) summarising BONIFACE reports on mechanical problems with German vehicles purchased in Tunis that are not in working order; air warfare on the Russian Front near Nikolaev and Odessa; and the closure of the Corinth Canal by Royal Air Force (RAF) bombing.