That it is expedient to amend the law with respect to the National Debt (including the sinking funds therefor), Customs and Inland Revenue (including Excise), with or without amendment of the law relating to purchase tax of the following descriptions:—
(a) amendments to exempt from tax, or charge with tax at the first or second rate (instead of a higher rate), goods comprised in Group 4, 11, 12 or 31 and now chargeable at the first rate, or goods comprised in Group 5 or 6 and now chargeable at the first or second rate, or goods comprised in Group 23 and now chargeable at the first, second or third rate, but so as not to prejudice the power of the Treasury to make orders under section twenty-one of the Finance Act, 1948;(b) amendments to make provision for the giving to the Treasury of advice and assistance in the exercise of the said power by a body to be constituted for the purpose, and for the powers and duties in that behalf of that body and other subordinate matters.