13(1)This paragraph applies where—
(a)tax is chargeable under paragraph 8 (withdrawal of group relief),
(b)the amount so chargeable has been finally determined, and
(c)the whole or part of the amount so chargeable is unpaid 6 months after the date on which it became payable.
(2)The following persons may, by notice under paragraph 14, be required to pay the unpaid tax (together with any interest payable)—
(a)the seller;
(b)any company that at any relevant time was a member of the same group as the buyer and was above it in the group structure;
(c)any person who at any relevant time was a controlling director of the buyer or a company having control of the buyer.
(3)For the purposes of sub-paragraph (2)(b)—
(a)a “relevant time” means any time between the effective date of the relieved transaction and the buyer ceasing to be a member of the same group as the seller;
(b)a company (“company A”) is “above” another company (“company B”) in a group structure if company B, or another company that is above company B in the group structure, is a 75% subsidiary of company A.
(4)In sub-paragraph (2)(c)—
“director”(“cyfarwyddwr”), in relation to a company, has the meaning given by section 67(1) of the Income Tax (Earnings and Pensions) Act 2003 (c. 1) (read with subsection (2) of that section) and includes any person falling within section 452(1) of the Corporation Tax Act 2010 (c. 4);
“controlling director”(“cyfarwyddwr â rheolaeth”), in relation to a company, means a director of the company who has control of it (construing control in accordance with sections 450 and 451 of the Corporation Tax Act 2010 (c. 4)).
(5)For the purposes of this paragraph, a claim is not finally determined until—
(a)the claim, or
(b)the amount to which it relates,
can no longer be varied (whether on review, appeal or otherwise).