(1)Except as otherwise provided, the effective date of a land transaction for the purposes of this Act is—
(a)the date of completion, or
(b)such alternative date as the Scottish Ministers may prescribe by regulations.
(2)Other provision as to the effective date of certain land transactions is made by—
(a)section 10(2) (substantial performance of contract without settlement),
(b)section 11(4) (substantial performance of contract requiring conveyance to third party),
(c)section 12(4) (options and rights of pre-emption), and
(d)paragraph 25(2) of schedule 19 (agreement for lease substantially performed etc.).