Letters of last resort
The letters of last resort are four identically-worded handwritten letters from 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 otherwise incapacitated both the prime minister and their designated "second person", typically a high-ranking member of the Cabinet, such as the Deputy Prime Minister or the First Secretary of State, to whom the prime minister has designated the responsibility of choosing how to act, in the event that they die in office. In the event that the orders are carried out, the action taken could be the last official act of the Government of the United Kingdom.
If the letters are not used during the term of the prime minister who wrote them, they are destroyed unopened after that person leaves office, so that their content remains unknown to anyone except the issuer.
A new prime minister writes a set of letters immediately after taking office and being told by the Chief of the Defence Staff "precisely what damage a Trident missile could cause". The documents are then delivered to the submarines in sealed envelopes, and the previous prime minister's letters are destroyed without being opened.
In the event of the deaths of both the prime minister and the designated alternative decision-maker as a result of a nuclear strike, the commander(s) of any nuclear submarine(s) on patrol at the time would use a series of checks to ascertain whether the letters of last resort must be opened.
According to Peter Hennessy's book The Secret State: Whitehall and the Cold War, 1945 to 1970, the process by which a Vanguard-class submarine commander would determine if the British government continues to function includes, amongst other checks, establishing whether BBC Radio 4 continues broadcasting.
While the contents of these letters are secret, 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 might instruct the submarine commander to:
- retaliate with nuclear weapons;
- not retaliate;
- use their own judgement; or,
- place the submarine under an allied country's command, if possible. The documentary mentions Australia and the United States.
The Guardian reported in 2016 that the options are said to include: "Put yourself under the command of the US, if it is still there", "Go to Australia", "Retaliate", or "Use your own judgement". The actual option chosen remains known only to the writer of the letter.
David Greig's 2012 play The Letter of Last Resort deals with the consequences and paradoxes of the letters. The play was first staged in February 2012 as a part of a cycle of plays on "The Bomb" at the Tricycle Theatre in London, directed by Nicolas Kent, with Belinda Lang playing the role of the incoming prime minister and Simon Chandler her advisor. The production was also seen at the Traverse Theatre in Edinburgh, for the Edinburgh Fringe later the same year. The following year it was broadcast on BBC Radio 4, with the same cast, first transmitted on 1 June 2013.
- Operation Looking Glass
- Dead Hand
- Mutually assured destruction
- Nuclear weapons and the United Kingdom § Nuclear weapons control
- Trident nuclear programme
- Dead man's switch
- "Brown move to cut UK nuclear subs". BBC News. 23 September 2009. Retrieved 24 January 2011.
- Taylor, Adam (13 July 2016). "Every new British prime minister pens a handwritten 'letter of last resort' outlining nuclear retaliation". Washington Post. Retrieved 13 July 2016.
- Rosenbaum, Ron (January 2009). "The Letter of Last Resort". Slate Magazine. Retrieved 18 March 2012.
[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.
- Norton-Taylor, Richard (11 July 2016). "Theresa May's first job: decide on UK's nuclear response". the Guardian. Retrieved 13 July 2016.
- Bunkall, Alistair (13 July 2016). "May To Be Handed Keys To Nuclear Red Button". Sky News. Retrieved 13 July 2016.
- "Theresa May's grim first task: Preparing for nuclear armageddon". Politico. 15 July 2016. Retrieved 15 July 2016.
- Rogoway, Tyler (1 February 2017). "Letters Of Last Resort Are Post-Apocalyptic Orders for UK Vanguard Sub Crews". The Drive. Retrieved 3 December 2018.
- Goodall, David (26 May 1983). "Arrangements for briefing a new Prime Minister in the event of a change of administration following the 1983 General Election" (PDF). TNA) (published 1 August 2013). CAB 196/124. Retrieved 5 September 2013.
- David Greig, The Letter of Last Resort (full text of play), front-step.co.uk (David Greig's official website), posted 30 September 2015.
- Michael Billington, The Bomb - review, The Guardian, 21 February 2012
- Edinburgh Transfer: The Letter of Last Resort, Tricycle Theatre, August 2012
- "Saturday Drama, The Last Resort". BBC Radio 4 website. 1 June 2013. Retrieved 1 June 2013.
- Frost, Vicky (7 May 2015). "The Game recap: series one, episode two – Operation Glass is revealed". The Guardian. Retrieved 14 November 2018.
- "The Human Button". BBC Radio 4. 2 December 2008. Retrieved 10 February 2015.
- Rosenbaum, Ron (9 January 2009). "The Letter of Last Resort". Slate. Retrieved 10 February 2015.
- Radio archive: Glass, Ira (22 January 2010). "399: Contents Unknown (Prologue)". This American Life. Retrieved 10 February 2015.