(1) If there is any inconsistency between a written direction given to a sector transport agency by the Secretary and a written direction given by the Minister, the direction given by the Minister prevails to the extent of the inconsistency.
(2) An act or decision or the performance of a function or exercise of any power by a sector transport agency is not invalid only because of any inconsistency between—
(a) directions given to the sector transport agency; and
(b) functions performed or powers exercised by the sector transport agency.