8Qualifying assets
(1)Subject to paragraph 4 of Schedule 2 to this Act, for the purposes of this Act a " qualifying asset", in relation to a participator in an oil field, means an asset—
(a)which either is not a mobile asset or is a mobile asset dedicated to that oil field; and
(b)in respect of which expenditure incurred by the participator is allowable, or has been allowed, for that field under section 3 above, section 4 of the principal Act or, subject to subsection (2) below, section 3 of that Act.
(2)If, in respect of any asset, the only expenditure which falls within subsection (1)(b) above is expenditure allowable or allowed under section 3 of the principal Act, the asset shall not be a qualifying asset unless, at the time the expenditure was incurred, it was expected that the useful life of the asset would continue after the end of the claim period in which the asset was to be first used in a way which would constitute use in connection with an oil field for the purposes of that section.
(3)Subject to subsection (4) below, the oil field to which are attributable tariff receipts or disposal receipts referable to a qualifying asset is that field for which the expenditure referred to in subsection (1)(b) above is allowable; and, if there is more than one such field, then.—
(a)in the case of a mobile asset, no account shall be taken of a field to which it is not dedicated; and
(b)no account shall be taken of a field in relation to which the asset is a qualifying asset by virtue only of paragraph 1 of Schedule 1 to this Act; and
(c)subject to paragraphs (a) and (b) above, it is that one of those fields in relation to which a development decision was first made ;
and subsection (7) of section 5A of the principal Act (time when development decision is made) shall have effect for the purposes of paragraph (c) above as it has effect for the purposes of subsection (1)(c) of that section.
(4)In the case of an asset which, in relation to the participator in question, is a qualifying asset by virtue only of paragraph 1 of Schedule 1 to this Act, the oil field to which are attributable tariff receipts or disposal receipts referable to the asset is that to which (in accordance with subsection (3) above) those receipts would be attributable if they were referable to the other asset referred to in sub-paragraph (1)(d) of that paragraph (that is to say, the asset in association with which the first asset is, or is expected to be, used).
(5)In relation to a qualifying asset or the tariff receipts or disposal receipts referable to it, in this Act " chargeable field " means the field referred to in subsection (3) or, as the case may be, subsection (4) above.