18.—(1) For the heading to Schedule 1 there shall be substituted the following heading—
“INERT GAS SYSTEMS: STANDARD REQUIREMENTS”.
(2) In paragraph (1) of Schedule 1—
(a)after “Every fixed inert gas system” there shall be inserted “provided in accordance with regulation 48(1) or (4) of these Regulations”; and
(b)for “(m)(iii)(2)” there shall be substituted “(m)(iii)(B)”.