(a) by omitting from subregulation (1) “, the minimum weights of lead waste and ventilator pipes, and the minimum thickness of cast-iron soil and waste pipes, which shall be used,”;
(b) by omitting from the first column of the table at the foot of subregulation (1) “Lavatories and wash” and substituting “Wash”;
(c) by omitting the third and fourth columns of the table at the foot of subregulation (1); and
(d) by omitting subregulations (2), (3), (4) and (5).