(1)Sections one to three of the Finance Act, 1950 (which relate to the duties of customs and excise on hydrocarbon oils and to the duty of excise on petrol substitutes), shall have effect as if in the said section one—
(a)in subsection (1) (which relates to the rate of customs duty) for the words from " eighteen pence a gallon " onwards there were substituted the words " one shilling and tenpence halfpenny a gallon ";
(b)in subsection (2) (which relates to the rates of the customs rebates allowed on the delivery for home consumption of heavy oils) for the words from " eighteen pence a gallon " to the end of paragraph (a) there were substituted the words " one shilling and ten pence halfpenny a gallon ", and for the words from " seventeen pence a gallon " to the end of paragraph (b) there were substituted the words " one shilling and ninepence halfpenny a gallon " ;
and the rate of the duty of excise charged under section three of the Finance Act, 1938, on spirits used for making power methylated spirits shall be the same as that at which the said duty of customs on hydrocarbon oils is for the time being chargeable:
Provided that the allowance payable under subsection (4) of section eight of the Finance (No. 2) Act, 1945, in respect of indigenous oils used in a refinery shall not be increased by virtue of this subsection in the case of oils charged with the excise duty on their removal to a refinery before the increased rate for the duty had come into force.
(2)This section, except as respects power methylated spirits, shall have effect as from six o'clock in the evening of the tenth day of April, nineteen hundred and fifty-one and as respects power methylated spirits shall have effect as from the eleventh day of that month.