136. (1) On the hearing of an application for leave to withdraw a petition, any person who, under section 21, would be eligible to apply for leave to present a petition, may apply to the court to be substituted as a petitioner, and the court may, if it thinks fit, substitute that person accordingly.

(2) In case the court substitutes a petitioner under paragraph (1) and is of opinion that the application for leave to withdraw the petition was the result of any agreement or undertaking the making of which or the entering into which is declared by rule 125 to be an offence, the court may direct that the security for costs given by the original petitioner shall remain as security for the costs that may be incurred by the substituted petitioner and that, to the extent of the sum named in the security, the original petitioner and his or her sureties, if any, shall be liable to pay the costs of the substituted petitioner.