For section 28G of the 1991 Act (effect and duration of departure directions) there shall be substituted—
(1)An application for a variation may also be made when a maintenance calculation is in force.
(2)The Secretary of State may by regulations provide for—
(a)sections 16, 17 and 20; and
(b)sections 28A to 28F and Schedules 4A and 4B,
to apply with prescribed modifications in relation to such applications.
(3)The Secretary of State may by regulations provide that, in prescribed cases (or except in prescribed cases), a decision under section 17 made otherwise than pursuant to an application for a variation may be made on the basis of a variation agreed to for the purposes of an earlier decision without a new application for a variation having to be made.”