Buy Doctor Who: The Taking of Chelsea 426 http://www.audiogo.com/uk/doctor-who-the-taking-of-chelsea-426-david-llewellyn-gid-20565
The Chelsea Flower Show - hardly the most exciting or dangerous event in the calendar, or so the Doctor thinks. But this is Chelsea 426, a city-sized future colony floating on the clouds of Saturn, and the flowers are much more than they seem. As the Doctor investigates, a familiar foe arrives, and the stakes suddenly get much higher. The Sontarans have plans of their own, and they're not here to arrange flowers.
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The Taking of Chelsea 426 was one of the last set of three original novels published featuring...