18. Amendment of section 18 (duration and continuance of registration) of Principal Act.
Section 18 of the Principal Act is amended by the substitution of the following subsection for subsection (2):
"(2) The prescribed period (which shall not be less than one year) shall be calculated -
(a) in the case of a first registration from the date on which the relevant entry was made in the register, and
(b) in the case of a registration which has been continued under this section, from the day following the expiration of the latest prescribed period.".