A special edition of Blue Peter marks the show's 5000th episode, with the launch of a new Diamond Badge, designed by international fashion designer Henry Holland.The first Blue Peter badge was launched 55 years ago, and today a host of well-known faces talk about how special the Blue Peter badge is.Lindsey takes a trip to HMS Belfast to help with some key maintenance of the ship, including climbing the mast over 100 feet above the River Thames.Nine year-old magician Issy Simpson, who appeared on Britain's Got Talent, performs some illusions live in the studio.

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