Sch 9ZA para 50
(1) A person who becomes liable to be registered under this Part of this Schedule must notify the Commissioners of the liability within the period of 30 days after the day on which the liability arises. (2) The Commissioners must register any such person (whether or not the person has notified them) with effect from the day on which the liability arose or from such earlier time as may be agreed between the Commissioners and the person.