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4. In section 58—
(a)for the word “Unit” in both places in which it appears, there shall be substituted the words “Secretary of State”;
(b)in paragraph (a), for the words “if the Secretary of State so directs” there shall be substituted the words “if he thinks fit”; and
(c)in paragraph (b), the words “and the Secretary of State approves” shall cease to have effect.