If an assurer provides a membership audit certificate in relation to a reporting period to a trade union which states that, in the assurer's opinion—
the union's system for compiling and maintaining the register was not satisfactory for the purposes of complying with the union's duties under section 24(1) throughout that period, or
the assurer has failed to obtain the information and explanations which the assurer considers necessary for the performance of the assurer's functions,
the assurer must send a copy of the certificate to the Certification Officer as soon as is reasonably practicable after it is provided to the union.