The Thin Blue Line was set in the police station of a fictional town of Gasforth, and one of the main themes was the rivalry between the uniformed squad, led by Inspector Fowler and the CID detectives, led by Detective Inspector Grim, who provided much humour because of his use of the English language. Episodes frequently saw the uniformed branch and CID locking horns over similar, or in some cases the same, issues, by having conflicting views or methods of operation. Inevitably, the uniformed section would triumph over the Detectives.

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