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Different media written at different times by different people, especially if published by different publishers, can often contain conflicting information. This is nothing new in the Doctor Who Universe, and the "Lungbarrow" (novel) inconsistency is one of the more famous of these incidents, along with the UNIT dating controversy. The BBC has never given a statement as to which event is the "true" one in such instances of conflict, so it is up to the individual fan to decide for themselves how the different events fit in with continuity.