found in the Editorial Practice Guide). Each annotation is identified by a sequential reference number. For F-notes, M-notes and X-notes, the number also appears in bold superscript at the relevant location in the text. All annotations contain links to the affecting legislation. (a) subject to any regulations in force by virtue of subsection (1) of the preceding section, [ F28 the appropriate agency ] may --  (i) on its own initiative, serve a notice on the holder of the licence modifying the conditions specified in the licence to any extent which, in the opinion of [ F28 that agency ] , is desirable and is unlikely to require unreasonable expenditure by the licence holder, and (ii) on the application of the licence holder, serve a notice on him modifying the said conditions to the extent requested in the application; and (b) it shall be the duty of [ F28 that agency ] to serve a notice on the licence holder modifying the conditions specified in the licence --  (i) subject to subsection (4) of this section, to the extent which in the opinion of the authority is required for the purpose mentioned in section 9(1)(a) of this Act, and (ii) to the extent required by any regulations in force as aforesaid. (2) Subsection (4) . . . F29 of section 5 of this Act shall with the necessary modifications apply to a proposal to serve a notice in pursuance of paragraph (a) or paragraph (b)(i) of the preceding subsection as