(a) In this section-
'available losses', in relation to an accounting period of a participating institution, means losses, carried forward from preceding accounting periods, for which relief is available under section 396(1) in that accounting period or succeeding accounting periods;
'group company', for an accounting period in relation to a participating institution (in this definition referred to as the 'first-mentioned institution'), means a company which is a participating institution that has an accounting period that coincides with the accounting period of the first-mentioned institution where, throughout the accounting period of the first-mentioned institution-
(a) the company is a subsidiary of the first-mentioned institution,
(b) the first-mentioned institution is a subsidiary of the company, or
(c) both the company and the first-mentioned institution are subsidiaries of a third company;
'participating institution' and 'subsidiary' have the same meanings respectively as in
…