(1) This section shall apply to -
(a) any gain, whether realised or unrealised, attributable to a relevant monetary item (within the meaning of section 79) which would but for this Part be taken into account in computing the trading income of a company's tonnage tax trade in accordance with section 79, and
(b) any gain, whether realised or unrealised, attributable to a relevant contract (within the meaning of section 79) which would but for this Part be taken into account in computing the trading income of a company's tonnage tax trade in accordance with section 79.
(2) Where this section applies to any gain, the gain shall be treated as income for the purposes of the definition of 'relevant shipping income' in section 697A.