(1)Subject to the following provisions of this section and sections 356 to 358, section 354 shall not apply unless the land, caravan or house-boat in question—
(a)is at the time the interest is paid used as the only or main residence of the person by whom it is paid (“the borrower”) or of a dependent relative or former or separated spouse of his, or, if the interest is paid less than 12 months after the date on which the loan is made, is so used within 12 months after that date; or
(b)is, in any period of 52 weeks comprising the time at which the interest is payable and falling wholly or partly within the year of assessment, let at a commercial rent for more than 26 weeks and, when not so let, either available for letting at such a rent or used as mentioned in paragraph (a) above or prevented from being so available or used by any works of construction or repair;
and shall in a case within paragraph (a) above apply only within the limit imposed by section 357.
(2)If it appears to the Board reasonable to do so, having regard to all the circumstances of a particular case, they may direct that in relation to that case subsection (1) above shall have effect as if for the references to 12 months there were substituted references to such longer period as meets the circumstances of that case.
(3)The land, caravan or house-boat does not fall within subsection (1)(a) above by reason of its being used as the only or main residence of a dependent relative of the borrower unless it is provided rent-free and without any other consideration.
(4)Relief under section 353 for interest eligible for it by virtue of section 354 in a case where it is eligible only because the land, caravan or house-boat referred to in it falls under subsection (1)(b) above shall be given only against income from the letting of that or any other land, caravan or house-boat, but may, if and to the extent that such income for the year of assessment is insufficient, be given against such income for the following year, and so on, provided the first-mentioned land, caravan or house-boat continues to fall under that subsection.
(5)Subsection (1)(a) of section 354 shall not apply—
(a)where the seller and purchaser are husband and wife and either sells to the other, or
(b)where the purchaser, or the wife or husband of the purchaser, has since 15th April 1969 disposed of an estate or interest in the land, or the property in the caravan or house-boat, in question, and it appears that the main purpose of the disposal and purchase was to obtain relief in respect of interest on the loan, or
(c)where the purchasers are the trustees of a settlement, and the seller is the settlor, or the wife or husband of the settlor, and it appears that the main purpose of the purchase is to obtain relief in respect of interest on the loan, or
(d)where the purchaser is directly or indirectly purchasing from a person who is connected with him, and the price substantially exceeds the value of what is acquired;
and subsection (1)(b) of that section shall not apply where the person spending the money is connected with the person who directly or indirectly receives the money, and the money substantially exceeds the value of the work done.
For the purposes of this subsection—
(i)references to a husband and wife are references to a husband and his wife living with him; and
(ii)one person is connected with another if he is so connected within the terms of section 839.