28.—(1) Subject to paragraph (2) of this regulation and without prejudice to regulation 26(3), the time at which notification takes effect (“the effective time”) is—
(a)where a previous period of notification remains in force, on the expiration of that period;
(b)where the person giving notification requests a date for commencement, at the beginning of the date so requested;
(c)in any other case, at the beginning of the fourth business day following the day on which notification is given.
(2) A notification cannot take effect before the time at which the Agency issues the premises code for the period covered by the notification.