Many hit U.S. reality TV shows have their roots in the U.K., ranging from American Idol (a copy of the British smash Pop Idol) to The Mole. However, not every reality show can succeed in both countries. For example, Survivor, the idea of a U.K. production company, was never produced in the U.K. until after it became a U.S. hit, and it then flopped completely there. And its clone, I'm A Celebrity ... Get Me Out Of Here!, featuring D-list celebs, remains a U.K. phenomenon despite being a superdud in the U.S.

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