. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F1

It shall be the duty of the controlling authority of a public airport company to exercise their control over the company so as to ensure that the company appoints as auditors of the company only persons who, in addition to being [F2eligible for such appointment in accordance with Part II of the Companies Act 1989], are approved for appointment as such auditors by the Audit Commission for Local Authorities in England and Wales.

Where the controlling authority of a public airport company are a composite authority, the duty imposed by subsection (5) is a joint duty of both or all of the constituent councils of that authority.

Section 21(4) applies for the purposes of this section.