(1)A direction under Parts 3 and 4 of this Act—
(a)must be complied with;
(b)must be in writing;
(c)may be varied or revoked by a later direction.
(2)A local authority, the governing body of a maintained school and the governing body of a maintained nursery school must, in the exercise of their functions under this Act, have regard to any guidance issued by the Welsh Ministers.