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Letters of last resort

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Title: Letters of last resort  
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Subject: UK Trident programme, Nuclear warfare, Nuclear weapons and the United Kingdom, Cabinet Office (United Kingdom), Dead Hand (nuclear war)
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Letters of last resort

The United Kingdom relies on four Vanguard-class submarines to provide its nuclear deterrent. At least one submarine is always armed and on active service, carrying 16 Trident II submarine-launched ballistic missiles each with a range of 7000 miles (11000km).[1]

The letters of last resort are four identically-worded handwritten letters written by the Prime Minister of the United Kingdom to the commanding officers of the four British ballistic missile submarines. They contain orders on what action to take in the event that an enemy nuclear strike has destroyed the British government and has killed or incapacitated both the Prime Minister and the "second person" (normally a high-ranking member of the Cabinet) whom the Prime Minister has designated to make a decision on how to act in the event of the Prime Minister's death. In the event that the orders were to be carried out, the action taken could be the last official act of Her Majesty's Government.

The letters are stored inside two safes in the control room of each submarine.[2] The letters are destroyed unopened after a Prime Minister leaves office, so their content remains known to only them.[3]


In the event of the death of the Prime Minister and the designated alternative decision-maker as a result of a nuclear strike, the commander(s) of the nuclear submarine(s) (at any time at least one is on patrol) will use a series of checks to ascertain whether the letters of last resort will have to be opened.

According to Peter Hennessy's book The Secret State: Whitehall and the Cold War, 1945 to 1970, the process by which a Trident submarine commander would determine if the British government continues to function includes, amongst other checks, establishing whether BBC Radio 4 continues broadcasting.[4] Submarines on patrol were reported to have briefly gone on nuclear alert in 2004 when Radio 4 mysteriously went off the air for 15 minutes.[5]

In 1983, the procedure for Polaris submarines was to open the envelopes if there was an evident nuclear attack, or that all UK naval broadcasts had ceased for four hours.[6]


According to the December 2008 BBC Radio 4 documentary The Human Button, there were four known options given to the Prime Minister to include in the letters. The Prime Minister instructs the submarine commander to:


David Grieg's 2012 play The Letter of Last Resort deals with the consequences and paradoxes of the letters. It was dramatised for BBC Radio 4, directed by Nicolas Kent and first broadcast on 1 June 2013.[7]

A similar process was used in the book Down to a Sunless Sea, in which the planes of Air Britain, the country's only remaining civilian airline, were instructed on what to do in the event that the UK was struck by nuclear weapons. The instructions were in the form of a special letter in a sealed compartment in the cockpit. The special instructions were to be used if the company dispatcher issued an "Armada Signal" or if the plane was unable to return to the UK because its airports had been destroyed by nuclear strikes.

See also


  1. ^ "Brown move to cut UK nuclear subs". BBC News. 23 September 2009. Retrieved 24 January 2011. 
  2. ^ Rosenbaum, Ron (January 2009). "The Letter of Last Resort". Slate Magazine. Retrieved 2009-05-18. In the control room of the sub, the Daily Mail reports, "there is a safe attached to a control room floor. Inside that, there is an inner safe. And inside that sits a letter. It is addressed to the submarine commander and it is from the Prime Minister. 
  3. ^ Rosenbaum, Ron (January 2009). "The Letter of Last Resort". Slate Magazine. Retrieved 2012-03-18. [E]very prime minister in recent years has written such a letter and ... letters that go unused (Tony Blair's for instance) are destroyed without being read. 
  4. ^ "HMS Apocalypse: Deep in the Atlantic, a submarine waits on alert with nuclear missiles that would end the world...". Daily Mail (London). Retrieved 10 May 2012. 
  5. ^ "Radio silence puts subs on nuclear alert". Manchester Evening News. 12 August 2004. 
  6. ^ Goodall, David (1983-05-26), Arrangements for briefing a new Prime Minister in the event of a change of administration following the 1983 General Election ( 
  7. ^ "Saturday Drama, The Last Resort". BBC Radio 4 website. 1 June 2013. Retrieved 1 June 2013. 

External links

  • "HMS Apocalypse: Deep Atlantic submarine waits alert for nuclear missiles to end the World". London: The Daily Mail. 30 November 2008 .
  • "Radio 4". BBC  .
  • Rosenbaum, Ron. "The Letter of Last Resort". Slate (article) 
  • "Prologue". (radio archive) (episode 399)  .
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