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A never-before-seen pocket plan of the Titanic that was kept by a survivor who had been desperate to see and iceberg is tipped to sell for £30,000.

Caroline Bonnell took the folded-up diagram layout of the huge liner with her when she entered a lifeboat with most of her family before the ship sank.

Earlier that fateful evening, the 30-year-old had expressed her desire to see an iceberg as the Titanic steamed across the north Atlantic.