5Subject to the following provisions of this Part of this Schedule, where section 11(6) of this Act applies the period during which the Secretary of State may levy tolls is—
(a)where the appointment of the person appointed under that section to levy tolls comes to an end after the transfer date, the period beginning immediately after the termination of his appointment and ending at the end of the period of twenty years beginning with the transfer date; or
(b)in any other case, that period of twenty years;
and the period applicable in accordance with this paragraph is referred to below in this Part of this Schedule as the original maximum toll period.