4.—(1) Nothing in the application of the Act by virtue of article 3 confers on an immigration officer any power—
(a)to charge a person with any offence; or
(b)to release a person on bail.
(2) Accordingly, in the Act as it applies by virtue of article 3—
(a)references to a person being charged with an offence are to a person being charged with an offence by a constable, and
(b)references to a person being released on bail are to a person being released on bail by a constable.
(3) Nothing in the application of the Act by virtue of article 3 confers on an immigration officer any power to detain a person for an offence after the person has been charged with that offence.