Another key exhibit is a 110-year-old lemon used as evidence against German spy Karl Muller. Muller used lemon juice as invisible ink to inform on British troop movements....
A warm iron was passed over a letter to reveal the secret messages. When he was arrested, the lemon was found in his overcoat....
Whether that fiction is George Smiley or Jackson Lamb." MI5 life is about ordinary human beings together doing extraordinary things to keep our country safe....
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2025-04-02 00:00:00.0