Citing the close bond of family life as the greatest defence against the unknown, the speech also mentioned the queen's second son Prince Andrew, who was serving in the Royal Navy at the time.
"If families remain united and resolute, giving shelter to those living alone and unprotected, our country's will to survive cannot be broken," she was to have said.
The papers were released by the National Archives as part of a 30-year rule that sees official records from the Prime Minister's office and Cabinet Office released to the public.
They also revealed how Margaret Thatcher, who was the prime minister at the time, dismissed the idea of hiring the then 21-year old William Hague - now Foreign Secretary - as an advisor to the Treasury.
"No," she wrote, underlining the word three times before adding "This is a gimmick and would be deeply resented by many who have financial economic experience." (Reporting by Li-mei Hoang, editing by Paul Casciato)
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