The fall of singapore: the great betrayal (2012)

This landmark documentary film by Paul Elston tells the incredible story of how it was the British who gave the Japanese the knowhow to take out Pearl Harbor and capture Singapore in the World War 2. For 19 years before the fall of Singapore in 1942 to the Japanese, British officers were spying for Japan. Worse still, the Japanese had infiltrated the very heart of the British establishment - through a mole who was a peer of the realm known to Churchill himself.