麻豆社

Later today, MPs will vote on whether to renew the UK's nuclear weapons system, Trident.

The current Trident submarines are due to finish their working lives next decade and MPs have been arguing over their potential replacement for a decade already.

Patricia Lewis, head of international security at the think tank Chatham House explains how the system works.

This clip is originally from 5 live Breakfast on July 18 2016.