Bbc The Secret War (1977)

Nuclear Secrets is a series of spy thrillers exploring the key turning-points in the race for nuclear supremacy. From the development of the A-bomb, via the Cuban missile crisis, to the spread of nuclear weapons to the Middle East and beyond, each story is told through the eyes of the men who risked everything to proliferate their nuclear secrets and those who tried to stop them. Nuclear weapons and the actions of these men have transformed the face of war – and now the world could pay the price.

At present the total nuclear arsenal of the world is no less than 27,000 nuclear warheads. Nine countries in the world (probably) have nuclear weapons and a dozen more have access to the resources and technology needed to produce such a weapon.