(1)The Secretary of State may, after consultation with the Post Office, by order suspend the exclusive privilege conferred on the Post Office by section 66(1) for such a period and to such extent as may be specified in the order.
(2)For the purposes of an order made under this section, any definition of a class of letters may be framed by reference to any circumstances whatever ; and in this subsection " letter " has the same meaning as in section 66.
(3)An order under this section may contain such supplementary, incidental and consequential provisions as may appear to the Secretary of State to be necessary or expedient.
(4)An order under this section shall be made by statutory instrument which shall be subject to annulment in pursuance of a resolution of either House of Parliament.