In subsection (3) of section forty-two of the Finance Act, 1956 (which, as amended by section thirty-six of the Finance Act, 1958, limits to one thousand and seventy million pounds the total of the advances which may be made under the said section forty-two and prohibits the making of such advances after the end of August, nineteen hundred and fifty-nine) for the words " one thousand and seventy " there shall be substituted the words " one thousand six hundred and twenty " and for the words " nineteen hundred and fifty-nine " there shall be substituted the words " nineteen hundred and sixty ".