original_query: What is the Trident nuclear programme in the United Kingdom?
query: What is the Trident nuclear programme in the United Kingdom?
answer: The Trident system is the UK's submarine-based nuclear deterrent.  It involves a stockpile of around 215 warheads (around 120 active), with at least one submarine on patrol at any time carrying up to 16 Trident missiles with a total of up to 48 warheads.  The system is based primarily in Scotland at HMNB Clyde and RNAD Coulport. Since 1998, it has also provided the option of a lower-yield nuclear strike capability.