10.—(1) A duty holder for an installation which is to be involved in a combined operation shall ensure that that installation does not engage in a combined operation unless a notification containing the particulars specified in Schedule 4 (other than those already notified to the Executive pursuant to regulation 17) in respect of that combined operation is sent to the Executive at least 21 days (or such shorter period as the Executive may specify) before it is due to commence.
(2) The requirements of paragraph (1) will be satisfied if—
(a)the duty holders for every installation involved in the combined operation prepare and agree a notification containing the particulars specified in that paragraph; and
(b)one of them sends it to the Executive at least 21 days (or such shorter period as the Executive may specify) before it is due to commence.
(3) Where there is a material change in any of the particulars notified pursuant to paragraph (1) prior to completion of the relevant combined operation, the duty holder shall notify the Executive of that change as soon as is practicable.
(4) Where there is a change in the duty holder or of the installation, the duty holder shall send a notification pursuant to paragraph (1).