It is revealed in the episodes "The Inspector Calls" and "Just Like Clockwork" that the only thing/person that scares Miss Hardbroom is Mistress Hecketty Broomhead (played by Janet Henfrey) who was her personal tutor at witch college.
Janet Jackson | Janet | Janet Maslin | Janet Napolitano | Janet Fish | Janet Guthrie | Janet Parshall | Janet Gaynor | Janet Reno | Janet Kay | Pierre Janet | Janet Jones | Janet Frame | Janet E. Smith | Janet Street-Porter | Janet Perry | Janet Langhart | Janet Woollard | Janet Waldo | Janet Steinbeck | Janet Radcliffe Richards | Janet Morris | Janet Mitchell | Janet Margolin | Janet Leigh | Janet Farrar | Janet Evans | Janet Brown | Janet Balaskas | Janet Backhouse |