Schedule 3, Part 4 Codes of practice (paras. 56-57)
(1) The Secretary of State must issue codes of practice about -
(a) training to be undertaken by constables, immigration officers and customs officers who are to act as examining officers or exercise other functions under this Schedule,
(b) the exercise by such persons of functions conferred on them by virtue of this Schedule,
(c) the video recording (with sound) of interviews by constables of persons detained under Part 1 of this Schedule at a police station, and
(d) reviews under Part 3 of this Schedule.
(2) An examining officer must perform the functions conferred by virtue of this Schedule in accordance with any relevant code of practice in operation under sub-paragraph (1)(b).
(3) A code of the kind mentioned in sub-paragraph (1)(c) -
(a) may make different provision in relation to a particular part of the United Kingdom;
(b) may make different provision for different parts of the United Kingdom.
(4) A code of the kind mentioned in sub-paragraph (1)(d) must include provision about training to be undertaken by persons who are to act as review officers.