‘(4) The Secretary of State shall issue a code of practice relating to the conduct of designated immigration officers for the purposes of section 2.
(5) Before issuing a code of practice under subsection (4), the Secretary of State shall consult—
(a) representatives of the Immigration Service;
(b) the Director General of the Immigration and Nationality Directorate;
(c) representatives of relevant trades unions;
(d) representatives of the Immigration Law Practitioners Association; and
(e) such other persons as he thinks fit.’.