 When the first series was being made, television pirates were  desperate to acquire the preview tapes. One of the people in the  office had the idea of labeling the tapes with the anagram  "Torchwood" rather than "Doctor Who", as a security measure to  disguise the tapes when they were delivered from Cardiff to London.  Writer Russell T. Davies (qv) liked this idea so much that it  later inspired him to use it as a title when creating the spin