(1)This section applies where—
(a)section 80 applies as regards the trustees of a settlement (“the migrating trustees”), and
(b)any capital gains tax which is payable by the migrating trustees by virtue of section 80(2) is not paid within 6 months from the time when it became payable.
(2)The Board may, at any time before the end of the period of 3 years beginning with the time when the amount of the tax is finally determined, serve on any person to whom subsection (3) below applies a notice—
(a)stating particulars of the tax payable, the amount remaining unpaid and the date when it became payable;
(b)stating particulars of any interest payable on the tax, any amount remaining unpaid and the date when it became payable;
(c)requiring that person to pay the amount of the unpaid tax, or the aggregate amount of the unpaid tax and the unpaid interest, within 30 days of the service of the notice.
(3)This subsection applies to any person who, at any time within the relevant period, was a trustee of the settlement, except that it does not apply to any such person if—
(a)he ceased to be a trustee of the settlement before the end of the relevant period, and
(b)he shows that, when he ceased to be a trustee of the settlement, there was no proposal that the trustees might become neither resident nor ordinarily resident in the United Kingdom.
(4)Any amount which a person is required to pay by a notice under this section may be recovered from him as if it were tax due and duly demanded of him; and he may recover any such amount paid by him from the migrating trustees.
(5)A payment in pursuance of a notice under this section shall not be allowed as a deduction in computing any income, profits or losses for any tax purposes.
(6)For the purposes of this section—
(a)where the relevant time (within the meaning of section 80) falls within the period of 12 months beginning with 19th March 1991, the relevant period is the period beginning with that date and ending with that time;
(b)in any other case, the relevant period is the period of 12 months ending with the relevant time.