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ITV News Central gets secret access to the Thunderbirds puppets

This weekend thousands of people are expected at RAF Cosford for a convention for fans of programmes such as Thunderbirds and Stingray, which were made by the forerunner of ITV.

Some of the original puppets still survive and are incredibly valuable - a puppet head can sometimes change hands for £40,000.

Our correspondent Mark Gough tracked some of the puppets down to where they are being kept in the Midlands - the condition to filming them was not revealing their location.