Question: Streamlining the Cities was issued by the government of what British stateswoman who was Prime Minister of the United Kingdom from 1979 to 1990?
Sentence (from "Letters of last resort"): 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 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.
Relevant evidence: No