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Calley and Ronnie use their secret language, Vince shows Hollo a secret room, and Mr. Griffiths prepares for 'Operation Harriet'.
First Air Date : Feb 08, 1978
Last Air date : Sep 15, 2008
Episode : 602 Episode
Season : 31 Season
Runtime: 25:20 minutes
Studio: BBC One
Country: United Kingdom
Crew:
