Brian Ash (Anthony Andrews) is a young lieutenant who is assigned to a UXB unit in the early days of World War II. UXB (UneXploded Bomb) is the signal that an aerial bomb has not exploded. Ash's job is to deactivate German bombs, some of which have fuses specifically designed to kill him. The series takes us through his maturation as an officer, a love story with Susan (Judy Geeson), and the stresses and strains of wartime on the civilians and military in England.
Changi follows the story of six young Australian mates who go to war. They land in Singapore in 1942, just in time for the surrender. They are marched off to Changi prison camp along with 15,000 others. Together, the six boys struggle to survive three and a half years of incarceration.