(1)A person is a taxable person for the purposes of this Act while he is, or is required to be, registered under this Act.
(2)[F15 Schedules 1 to 3AF15] shall have effect with respect to registration [F16(and see also Parts 8 and 9 of Schedule 9ZA which contain further provisions about registration)F16] .
(3)Persons registered under any of those Schedules [F17and Part 8 and 9 of Schedule 9ZAF17] shall be registered in a single register kept by the Commissioners for the purposes of this Act; and, accordingly, references in this Act to being registered under this Act are references to being registered under any of those Schedules [F18or those PartsF18] .
(4)The Commissioners may by regulations make provision as to the inclusion and correction of information in that register with respect to the Schedule under which any person is registered.