For the purposes of this Part, section 73 shall apply subject to the following and any other necessary modifications -
(a) the definition of 'appropriate authority' shall be construed as including the following paragraph after paragraph (a):
(b) in subsection (1), as if ', in accordance with the relevant international instrument,' was deleted, and
(c) in subsection (6), as if 'permitted by the relevant international instrument or' was deleted.