(1) The Commissioner shall -
(a) maintain a register of persons who have given notification under section 18, and
(b) make an entry in the register in pursuance of each notification received by him under that section from a person in respect of whom no entry as data controller was for the time being included in the register.
(2) Each entry in the register shall consist of -
(a) the registrable particulars notified under section 18 or, as the case requires, those particulars as amended in pursuance of section 20(4), and
(b) such other information as the Commissioner may be authorised or required by notification regulations to include in the register.
(3) Notification regulations may make provision as to the time as from which any entry in respect of a data controller is to be treated for the purposes of section 17 as having been made in the register.
(4) No entry shall be retained in the register for more than the relevant time except on payment of such fee as may be prescribed by