(1)Subject to subsection (2) below, any notice or other document required or authorised to be given, delivered or served under this Part or regulations made under this Part may be given, delivered or served either—
(a)by delivering it to the person to whom it is to be given or delivered or on whom it is to be served;
(b)by leaving it at the usual or last known place of abode of that person;
(c)by sending it in a prepaid letter addressed to that person at his usual or last known place of abode ;
(d)in the case of a body corporate, by delivering it to the secretary or clerk of the body at their registered or principal office, or sending it in a prepaid letter addressed to the secretary or clerk of the body at that office; or
(e)if it is not practicable after reasonable inquiry to ascertain the name or address of a person to whom it should be given or delivered, or on whom it should be served, as being a person having any interest in premises, by addressing it to him by the description of the person having that interest in the premises (naming them) to which it relates and delivering it to some responsible person on the premises, or affixing it or a copy of it to some conspicuous part of the premises.
(2)Where this subsection applies in relation to a public gas supplier, subsection (1) above shall not apply to notices to be given to or served on the supplier under section 10 above or any provision of Schedule 5 to this Act but any such notice—
(a)may be given or served by delivering it at, or sending it in a prepaid letter to, an appropriate office of the supplier; and
(b)in the case of a notice under paragraph 7(2) or 12(1) of that Schedule, shall be treated as received by the supplier only if received by him at an appropriate office.
(3)Subsection (2) above applies in relation to a public gas supplier if he divides his authorised area into such areas as he thinks fit and—
(a)in the case of each area, fixes offices of his which are to be appropriate offices in relation to notices relating to matters arising in that area ;
(b)publishes in each area, in such manner as he considers adequate, the addresses of the offices fixed by him for that area ; and
(c)endorses on every demand note for gas charges payable to him the addresses of the offices fixed for the area in question.