2(1)Where section 33(1)(a) of the [1965 c. 25.] Finance Act 1965 applies to exclude a gain which, in consequence of Part II of Schedule 6 to that Act, is not all chargeable gain, the amount of the reduction to be made under paragraph (b) of the said section 33(1) (corresponding reduction in allowable expenditure in respect of new asset) shall be the amount of the chargeable gain, and not the whole amount of the gain ; and in subsection (2)(b) of the said section 33 (corresponding reduction in allowable expenditure in respect of the new asset where part only of the consideration in respect of the old asset has been applied as such expenditure) for the reference to the amount by which the gain is reduced under paragraph (a) of that subsection there shall be substituted a reference to the amount by which the chargeable gain is proportionately reduced under the said paragraph (a).
(2)This paragraph shall be construed as one with the said section 33.
(3)This paragraph shall have effect for all years of assessment and accounting periods beginning before or after the passing of this Act.