6.—(1) In a case falling within article 3(a), the fee shall be payable by the person who gives the merger notice.
(2) Subject to article 7, in a case falling within article 3(b) or (c), the fee shall be payable by the acquirer.
(3) For the purposes of this article and article 7 “the acquirer” means the person, or group of persons, who has or have acquired or will, if those arrangements are carried into effect, acquire either—
(a)a controlling interest in one of the enterprises which was or is involved in the creation or possible creation of a relevant merger situation which is the subject of the merger reference or, as the case may be, the OFT’s or the Secretary of State’s decision not to make such a merger reference, and in which he or they did not previously have such an interest; or
(b)in the case of such an enterprise carried on by a body corporate in which he or they did not previously have a controlling interest, a controlling interest in that body corporate.
(4) In a case where paragraph (3) applies to more than one person, whether by virtue of them being treated as associated persons, as defined in section 127 of the Act, or otherwise, the persons to whom it applies shall be jointly and severally liable for the fee in that case.
(5) Where a fee is payable under article 3(b) or (c) but the acquirer is not—
(a)a United Kingdom national; or
(b)a body corporate incorporated under the law of the United Kingdom or of a part of the United Kingdom; or
(c)a person carrying on business in the United Kingdom, either alone or in partnership with one or more persons,
he shall not be liable to pay the fee unless the creation or possible creation of a relevant merger situation which is the subject of the merger reference or, as the case may be, the OFT’s or the Secretary of State’s decision not to make such a merger reference, results wholly or partially from anything done by him within the United Kingdom.