A relevant authority demonstrates compliance with the duty imposed by section 7—
(a)by making such arrangements as it considers appropriate to review any policy, strategy or service (as the case may be) which it develops or delivers in carrying out its functions, and
(b)either—
(i)in the case where the authority must prepare an island communities impact assessment under section 8(1), by preparing that assessment, or
(ii)in any other case, by making such an assessment or taking such other steps as the authority considers appropriate.