4In subsection (1) of section one hundred and seventeen (which requires changes in the crews of foreign-going ships to be reported) after the words " foreign-going ship " there shall be inserted the words " and every home trade ship to which section one hundred and fifteen A of this Act applies, being in each case a ship ", for the words " before finally leaving the United Kingdom " where they first occur, there shall be substituted the words " before leaving any port in the ' United Kingdom ", and for the said words, where they secondly occur, there shall be substituted the words " before leaving that port, and, if the ship has previously left any port in the United Kingdom, since leaving the last such port. "