Chief Inspector was a title for some police officers.
Chief Inspector Patrick Mullen and the Seventh Doctor suspected George Limb had sabotaged the Treaty of Versailles, influencing the beginning of World War II twenty years later. (PROSE: Illegal Alien)
After Professor Peach was found murdered, the Tenth Doctor used his psychic paper to establish himself as Chief Inspector Smith from Scotland Yard. (TV: The Unicorn and the Wasp)
Chief Inspector Robert Lines worked for the West Ealing Police and was responsible for the missing case of Ashley Stafford. (PROSE: The Lost Boy)