To save money Fisher turns over the police catering to a mass production company, The Happy Ploughman, clients of Margaret. Henry is appalled but investigates after several acts of sabotage against the firm. Former police canteen manager Tom Selly and his bread supplier Flora McKee are suspects and Henry arrests Flora. However such is the resentment in the force that no one uses the new automated canteen and Fisher hints that he would like to find discrepancies in The Happy Ploughman's books that would allow him to revoke the franchise. Henry duly obliges, as well as catching the real saboteur.
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