in part 4, insert
31A Directors-general may enter into contracts etc
(1) The responsible director-general of a directorate may—
(a) enter into a contract or memorandum of understanding relating to the operations of the directorate; and
(b) vary and administer the contract or memorandum of understanding.
(2) In exercising powers under subsection (1), the responsible director-general must act in accordance with section 31 and any requirements prescribed by regulation for this section.