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Of the original 21 novels, three were never adapted; Five on a Treasure Island and Five Have a Mystery to Solve because the Children's Film Foundation still had the film and TV rights to the books, while Five Have Plenty of Fun didn't fit in the production schedule.[2] Due to the success of the series, Southern Television were keen to make another season of episodes, but the Enid Blyton estate forbade them to create original stories.[3] One criticism of the series was that many of the episodes featured scenes set at night-time which were badly lit to the point that it was difficult to see what was happening.

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