The local authority may, with the consent of two-thirds in number and value of the ratepayers in any street, alter the name of such street - or any part of such street. The local authority may cause the name of any street or of any part of any street to be painted or otherwise marked on a conspicuous part of any building or other erection. Any person who shall wilfully and without the consent of the local authority, obliterate, deface, obscure, remove, or alter any such, name, shall be liable to a penalty not exceeding forty shillings.