13.—(1) Notwithstanding anything in the rules of a trade union or employers' association, a qualified auditor appointed to audit its accounts for the preceding year of account shall (subject to sub-paragraph (2)) be re-appointed as auditor for the current year of account unless—
(a)a resolution has been passed at a general meeting of the trade union or employers' association appointing somebody instead of him or providing expressly that he shall not be re-appointed; or
(b)he has given to the trade union or employers' association notice in writing of his unwillingness to be re-appointed; or
(c)he is ineligible for appointment as its auditor or one of its auditors for the current year of account; or
(d)he has ceased to act as its auditor or one of its auditors by reason of incapacity.
(2) Where notice is given of an intended resolution to appoint some person or persons in place of a retiring auditor and the resolution cannot be proceeded with at the meeting because of the death or incapacity of that person or persons, or because he or they are ineligible for appointment as auditor or auditors for the current year of account, the retiring auditor shall not be automatically re-appointed by virtue of this paragraph.
(3) For the purposes of this paragraph a person is ineligible for appointment as auditor of a trade union or employers' association for the current year of account if, but only if,—
(a)he would be precluded by paragraph 10 from acting as its auditor for that year; or
(b)he is not a qualified auditor at the time when the question of his appointment falls to be considered.
(4) In this paragraph “qualified auditor”, in relation to a trade union or employers' association, means a person qualified to be its auditor or one of its auditors in accordance with paragraphs 6 to 9, “the current year of account”, in relation to the appointment of a person as auditor, means the year of account in which the question of that appointment arises, and “the preceding year of account” means the year of account immediately preceding the current year of account.