Whenever it shall be certified to the local authority by the medical officer of health that it is desirable, with a view to prevent the spread of infectious disease, that they should be furnished with a list of the customers of any person or company earning a livelihood or deriving gain by the washing or mangling of clothes, the local authority may require such person or company to furnish to them a full and complete list of the names and addresses of the owners of clothes for whom such person or company washes or mangles, or has washed or mangled, during the past six weeks, and such person or company shall furnish such list accordingly, and the local authority shall pay to him, her, or them, for every such list, the sum of sixpence, and at the rate of sixpence for every twenty-five names contained therein, but no such payment shall exceed three shillings, and every person who shall wilfully or knowingly offend against this enactment shall, for each such offence, be liable to a penalty not exceeding five pounds, and to a daily penalty not exceeding twenty shillings.