An assurer appointed by a trade union under section 24ZB—
has a right of access at all reasonable times to the register of the names and addresses of the union's members and to all other documents which the assurer considers may be relevant to whether the union has complied with any of the requirements of section 24(1), and
is entitled to require from the union's officers, or the officers of any of its branches or sections, such information and explanations as the assurer considers necessary for the performance of the assurer's functions.
In subsection (1) references to documents include information recorded in any form.