5. No operator of a wagon or large container shall cause or permit to be carried therein any dangerous goods in bulk unless—
(a)the letter Y appears in column 8 of the Approved Carriage List in relation to those goods;
(b)any requirements specified in Schedule 2 relating to the carriage of those goods in that wagon or container are complied with;
(c)in the case of a wagon it is—
(i)closed,
(ii)open and sheeted, or
(iii)has a moveable roof; and
(d)in the case of a large container it is—
(i)closed, or
(ii)open and sheeted.