(1)This section applies where—
(a)regulations under section 1 are in force which by virtue of section 14 contain a power to specify a ship, and
(b)any specifications have been made by an appropriate Minister under that power.
(2)That appropriate Minister must in each review period—
(a)consider each specification of a ship which has effect under the regulations, and
(b)decide in the case of each such specification whether to revoke it or to take no action with respect to it (but see section 26(3)).
(3)For the purposes of this section each of the following is a “review period”—
(a)the period of 3 years beginning with the date when the regulations are made, and
(b)each period of 3 years that begins with the date of completion of a review under this section of specifications made under the regulations.