(1) The Secretary of State may by order amend or replace the conditions which determine for the purposes of this Part whether a relevant merger situation has been created.
(2) The Secretary of State shall not exercise his power under subsection (1) -
(a) to amend or replace the conditions mentioned in paragraphs (a) and (b) of subsection (1) of section 23;
(b) to amend or replace the condition mentioned in paragraph (a) of subsection (2) of that section.
(c) to amend or replace the condition mentioned in paragraph (a) of subsection (4C) of that section.
(3) In exercising his power under subsection (1) to amend or replace the condition mentioned in paragraph (b) of subsection (2) of section 23 or any condition which for the time being applies instead of it, the Secretary of State shall, in particular, have regard to the desirability of ensuring that any amended or new condition continues to operate by reference to the degree of commercial strength which results from the enterprises conc
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