(1)Except as otherwise provided, the effective date of a land transaction for the purposes of this Part is
[F461 (a)the date of completion, or
(b)such alternative date as the Commissioners for Her Majesty's Revenue and Customs may prescribe by regulations.F461]
(2)Other provision as to the effective date of certain descriptions of land transaction is made by—
F462 section 44(4) (contract and conveyance: contract substantially performed without having been completed), ...
[F463 section 44A(3) (contract providing for conveyance to third party),
section 45A(8) (contract providing for conveyance to third party: effect of transfer of rights),F463]
section 46(3) (options and rights of pre-emption).
[F465 paragraph 3(4) of Schedule 17A (leases that continue after a fixed term),F465]
[F466 paragraph 12A(2) of Schedule 17A (agreement for lease followed by substantial performance),
paragraph 12B(3) of that Schedule (assignment of agreement for lease occurring after agreement substantially performed), and