(1) The Secretary of State may by regulations make provision -
(a) to change (by increasing or decreasing) the proportion of shares or rights which a foreign power must hold in a person carrying on a newspaper enterprise, whether directly or indirectly, in order for the foreign power to be able to control or influence the policy of a person for the purposes of section 70A;
(b) to change (by increasing or decreasing) the proportion of shares or rights which is to be held by persons in a chain of persons for the purposes of determining whether shares or rights are held indirectly;
(c) about assumptions which are to be made when determining whether a foreign power is able to control or influence the policy of a person, including assumptions framed by reference to the ownership of shares or voting rights by any person;
(d) about the extent to which a foreign power needs to be able to control or influence the policy of a person in order to control or influence that policy for
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