My Uncle was on Heavy AA guns and was one of a number of radar operators that got sent out to Singapore in October 1941. After the capitulation he was sent in a hell ship to Vietnam where he spent a year unloading ships at Saigon, then was sent to the Death Railway for the rest of the war. He suffered a number of beatings, dysentery, malaria and beri-beri. He was one of the soldiers on the list of POWs that was the central theme in the book and film The Prisoner List.
The atom bombs stopped his camp being machine gunned by the Japanese - they had already had to dig the wide trenches where this was to happen and an allied landing was scheduled nearby and would have triggered the killing of prisoners only two days after the surrender.
Lived to be 93 but his health and nerves never recovered.