Impressive bloke Bill Travers. I looked him up on Wikipedia:
Travers enlisted in the British armed forces at eighteen, a few months after the outbreak of World War II, and was sent to India. Within a year he had advanced to the rank of Major. He also served in the 9th Gurkha Rifles in Burma, attached to General Wingate's staff, during which service he came to know John Masters who was his Brigade Major (Travers was later to act in Bhowani Junction, a tale written by Masters). When stricken by malaria, he was left behind in a native village. In order to avoid capture he disguised himself as a Chinese national, walked hundreds of miles through jungle territory until he reached an allied position, parachuted into Malaya, and worked there with the resistance forces until the end of the war.Considering he was a movie star signed to MGM in the 50s, it does seem a bit odd that "he couldn’t be traced by the War Office."