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"Orangeade"
This was the codeword that would allow a civil servant in London to be put through to Burlington, a secret bunker in Corsham, Wiltshire, warning that it was about to become the last bastion of British government after Soviet nuclear bombs had devastated the country. The procedure, detailed in the 1962 Cabinet Office War Book, released under the 50-year-rule, is a brief, chilling guide to what steps should be taken in the last hours before an attack.
One of the details from the latest batch of archives released from Kew. I love this time of year.
