On the application of the authorised undertaker, Scottish Ministers may, by order, extend, or further extend, the period referred to in section 40 (Time limit for exercise of powers of acquisition) provided that—
(a)such application is made prior to the expiry of the said period or any extension of that said period; and
(b)the period referred to in section 40, and any extension to the said period, cannot exceed ten years in total.