With the nuclear submarine TV series, Vigil, coming out last night, the UK’s leading expert on Trident, Dr Nick Ritchie from the University of York, joins James on Warfare.

Dr Nick gives us a step-by-step history on the multilayered missile system, which is said to act as a deterrence posture.

Earlier this year, Boris Johnson’s government agreed to increase the amount of nuclear weapons in the UK by around 40%, and it’s still unknown where the warheads would be stored if Scotland secure a second referendum and vote to leave the union.

Hear why the UK first got nuclear weapons, whether they actually work as a deterrence, and find out the many challenges which lie ahead.

Dr Nick’s book, A Nuclear Weapons-Free World?: Britain, Trident and the Challenges Ahead, is available now.