(b)the person against whom the claim is made has failed to contest the claim, it may, for reasons to be recorded in writing, direct that the insurer who may be liable in respect of such claim, shall be impleaded as a party to the proceeding and the insurer so impleaded shall thereupon have, without prejudice to the provisions contained in sub-section (2) of [section 150], the right to contest the claim on all or any of the grounds that are available to the person against whom the claim has been made.
