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Double Agents were a hard-boiled sweet with a gooey or sherberty centre in "Strawberry and Cream" or "Toffee Apple" flavours. They came in a paper encased foil tube and had a spy-related item on the back of the paper, such as a code, for exmaple. They cost about 10p for a pack in 1976 and were my favourite sweet for a while! They were possibly made by Trebor.
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