Application to be substituted as petitioner on withdrawal

Any person who might have been a petitioner in respect of the election to which the petition relates may, within five days after a notice under regulation 125 is published by the petitioner give notice in writing, signed by him or on his behalf, to the Registrar, of his intention to apply at the hearing to be substituted for the petitioner, but the want of such notice shall not defeat such application, if in fact made at the hearing.