Any unauthorised person who uses or wears any uniform, medal, badge or emblem issued by or with the authority of the Minister for the use of persons engaged in any civil defence service, or any uniform, medal, badge or emblem which, by reason of its resemblance to any such uniform, medal, badge or emblem as aforesaid or otherwise, is designed to indicate that the user or wearer is engaged in a civil defence service, shall be liable on summary conviction to a fine not exceeding twenty pounds.