3. Where a complaint is received, or a conduct matter comes to the attention of an appropriate authority, about conduct—
(a)by a person falling within section 12(7)(b) or (c) of the 2002 Act (employees of a police authority and special constables), or designated under section 39(2) of that Act (police powers for contracted-out staff);
(b)which occurred before 1st April 2004,
nothing in or made under Part 2 of the 2002 Act shall apply in relation to that complaint or conduct matter.