The period after which orders of the Treasury under section 9 of the [1961 c. 36.] Finance Act 1961 may not be made or continue in force (which, by section 60 of the [1972 c. 41.] Finance Act 1972, was extended until the end of August 1973) shall extend until the end of August 1974 or such later date as Parliament may hereafter determine.