49Information relating to allowances made in respect of old expenditure
(1)This section applies where a writing-down allowance (but no first-year allowance) has been made in respect of expenditure which is not new expenditure, and the amount of that allowance was determined without regard to section 42(2); and references below to an allowance are references to an allowance so determined.
(2)Where a person other than a company has claimed an allowance in respect of any expenditure, or a deduction on account of an allowance has been made in computing profits in respect of which a return has been made by a company, and the machinery or plant in question is at any time in the requisite period used for the purpose of being leased to such a person as is referred to in section 42(1)(a) and (b) otherwise than for a qualifying purpose, the person to whom it then belongs shall give notice of that fact to the inspector, specifying the use to which the machinery or plant has been put; and, subject to subsection (3) below, any such notice shall—
(a)be given within three months after the end of the chargeable period or its basis period in which the machinery or plant is first so used; and
(b)relate to all the items of machinery or plant (if more than one) in respect of which that person is required to give notice under this subsection in respect of that period.
(3)If at the end of the three months mentioned in subsection (2)(a) above the person concerned does not know and cannot reasonably be expected to know that any item of machinery or plant in respect of which he is required to give such a notice has been used as mentioned in that subsection, he shall in respect of that item give the notice within 30 days of his coming to know that it has been so used.
(4)Where an allowance has been made in respect of any expenditure, the inspector may by notice require—
(a)any person to whom the machinery or plant belongs or has belonged, or who is or has been in possession of it under a lease, during the requisite period; and
(b)the personal representatives of any such person,
to furnish him, within such period (not being less than 30 days) as may be specified in the notice, with such information as he may require and the person to whom the notice is addressed has or can reasonably obtain about the leasing of the machinery or plant or the use to which it is being or has been put.