(1)A person not domiciled in the United Kingdom at any time (in this section referred to as " the relevant time ") shall be treated for the purposes of this Act as domiciled in the United Kingdom (and not elsewhere) at the relevant time if—
(a)he was domiciled in the United Kingdom within the three years immediately preceding the relevant time, or
(b)he was resident in the United Kingdom in not less than seventeen of the twenty years of assessment ending with the year of assessment in which the relevant time falls.
(2)Subsection (1) above shall not apply for the purposes of section 6(2) or (3) or 48(4) above and shall not affect the interpretation of any such provision as is mentioned in section 158(6) above.
(3)Paragraph (a) of subsection (1) above shall not apply in relation to a person who (apart from this section) has not been domiciled in the United Kingdom at any time since 9th December 1974, and paragraph (b) of that subsection shall not apply in relation to a person who has not been resident there at any time since that date; and that subsection shall be disregarded—
(a)in determining whether settled property which became comprised in the settlement on or before that date is excluded property,
(b)in determining the settlor's domicile for the purposes of section 65(8) above in relation to settled property which became comprised in the settlement on or before that date, and
(c)in determining for the purposes of section 65(8) above whether the condition in section 82(3) above is satisfied in relation to such settled property.
(4)For the purposes of this section the question whether a person was resident in the United Kingdom in any year of assessment shall be determined as for the purposes of income tax, but without regard to any dwelling-house available in the United Kingdom for his use.