Where a certificate of insurance has been delivered in connection with a policy of insurance, the happening, in relation to a person insured by the policy, of any such event as is mentioned in subsection (1) or subsection (2) of section one of the Third Parties (Rights against Insurers) Act, 1930, shall, notwithstanding anything in that Act, not affect any such liability of that person as is required to be covered by a policy under Part IV of this Act, but nothing in this paragraph shall affect any rights against the insurer conferred by that Act on the person to whom the liability was incurred.