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Joan Barfield (Mary Watson) is a recurring background officer who usually fills in for other officers when they're needed. She also appears in the credits sequence between episodes 295 and 481..

Trivia Edit

  • The actress Delva Hunter also plays a policewoman in (episode 30)
  • Joan Barfield was also named Mary Watson during the earlier episodes.
  • In episode 151 Joan was referred to as Connie by Jim Fletcher

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