9.—(1) Sub-paragraph (2) applies to the duty holder of an installation, in respect of that installation, where—
(a)paragraph 3 or 4 continues to apply to the duty holder in respect of that installation;
(b)there is a period of no more than four months, or such longer period as the competent authority may specify, remaining until the end of the transitional period;
(c)there is a current safety case; and
(d)there is an intention, after the transitional period ends—
(i)in the case of a non-production installation, to operate it in external waters or move it in external waters with a view to its being operated there; or
(ii)in the case of a production installation, to operate it in external waters.
(2) Where this sub-paragraph applies the duty holder may make revisions to the current safety case—
(a)containing particulars, not required pursuant to the 2005 Regulations, but specified in—
(i)regulation 16 of and Schedule 7 to these Regulations, in the case of a non-production installation; or
(ii)in regulation 16 of and Schedule 6 to these Regulations in relation to a production installation; and
(b)which are otherwise appropriate in consequence of any revision made under paragraph (a).
(3) Revisions made under sub-paragraph (2) which make a material change to the current safety case are not effective unless—
(a)the duty holder sends a version of the current safety case which incorporates the proposed revisions, showing clearly where they are to be made, to the competent authority at least three months, or such shorter period as the competent authority may specify, before the revisions are to be made; and
(b)the competent authority accepts the revisions.