The following provisions do not apply to an appropriate officer or the relevant authority in the exercise of any function either has under this Chapter -
(a) section 67(9) of the Police and Criminal Evidence Act 1984 (application of codes of practice under that Act to persons other than police officers);
(b) Article 66(8) of the Police and Criminal Evidence (Northern Ireland) Order 1989 [S.I. 1989/1341 (N.I. 12).] (which makes similar provision for Northern Ireland).