If, for the purpose of obtaining admission to any house or other place, or of doing or procuring to be done any act which he would not be entitled to do or procure to be done of his own authority, or for any other unlawful purpose, any person falsely assumes the name, designation or character of a Commissioner or officer or of a person appointed by the Commissioners he may be detained and shall, in addition to any other punishment to which he may have rendered himself liable, be liable—
(a)on summary conviction, to a penalty of the prescribed sum, or to imprisonment for a term not exceeding 3 months, or to both; or
(b)on conviction on indictment, to a penalty of any amount, or to imprisonment for a term not exceeding 2 years, or to both.