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Jon Preddle is a New Zealand-born author who appeared on the New Zealand version of television programme Mastermind with specialist subject Doctor Who. He has also written an unofficial guide to Doctor Who called Timelink. This does however include facts such as K'anpo Rimpoche from Planet of the Spiders being the same character as Azmael from The Twin Dilemma, and a "resolution" of the UNIT dating controversy which states that the stories must have been set in the early 1970s as the episodes themselves were made using early 1970s production techniques.