3(1)Regulations may provide that where—
(a)as regards an asset falling within section 153(1)(a) or (b) of this Act an initial exchange gain or initial exchange loss accrues to a company for an accrual period under section 125 or 127 of this Act or would so accrue apart from regulations under this Schedule,
(b)at any time on a day in the period income represented by the asset was unremittable, and
(c)such other conditions as may be prescribed are fulfilled,
the amount of the gain or loss shall be found in accordance with the alternative method of calculation.
(2)Regulations may also provide that as regards any such day as is mentioned in sub-paragraph (1) above the accrued amount shall be ascertained in accordance with prescribed rules.
(3)Regulations may be so framed that the accrued amount as regards a day depends on the extent to which the income represented by an asset is unremittable.
(4)For the purposes of this paragraph income is unremittable if—
(a)in relation to the income, a notice under subsection (2) of section 584 of the Taxes Act 1988 (relief for unremittable overseas income) has been delivered to the inspector in accordance with subsection (6) of that section,
(b)it has been shown to the satisfaction of the Board that the conditions mentioned in paragraphs (a) and (b) of section 584(2) are satisfied with respect to the income, and
(c)those conditions have not ceased to be satisfied with respect to it.