UK, 1963—‘Mr. Plod’, also ‘P.C. Plod’, ‘Plod’: a humorous or mildly derogatory appellation for a policeman or for the police—alludes to ‘Mr. Plod’, the name of the policeman in stories by the English author of children’s fiction Enid Blyton
British-Army slang, 1972: a suit of protective clothing for use in nuclear, biological or chemical attacks—by extension: a suit of protective clothing for use by agricultural employees working with chemical sprays—perhaps refers to ‘Noddy’, a character in the writings of Enid Blyton
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