UK Nuclear Policy
The UK Trident programme was initiated during a period of increased tension known as the Second Cold War, and its capabilities were designed to deter powerful Warsaw Pact forces. By the time of the first Vanguard patrol in December 1994, the Soviet Union no longer existed and UK nuclear policy was gradually adjusted during the following years.
The final decision on firing the missiles is the responsibility of the British Prime Minister. Upon taking office, the Prime Minister is required to write four identical letters of last resort which are locked in a safe aboard each submarine. In the event of irrevocably losing contact with the UK, the commanding officer must follow the instructions in the letter if he believes that the United Kingdom has suffered an overwhelming attack. The content of the letters is not disclosed, but the orders may include launching a devastating retaliatory strike.
Under the terms of the missile lease arrangement, the United States does not have any veto on the use of British nuclear weapons, which the UK may launch independently.
Read more about this topic: UK Trident Programme
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