Law Enforcement (Powers and Responsibilities) Act 2002 No 103
105 Arrest may be discontinued
(1) A police officer may discontinue an arrest at any time.
(2) Without limiting subsection (1), a police officer may discontinue an arrest in any of the following circumstances:
(a) if the arrested person is no longer a suspect or the reason for the arrest no longer exists for any other reason,
(b) if it is more appropriate to deal with the matter in some other manner, including, for example, by issuing a warning or caution or a penalty notice or court attendance notice or, in the case of a child, dealing with the matter under the Young Offenders Act 1997.
(3) A police officer may discontinue an arrest despite any obligation under this Part to take the arrested person before an authorised officer to be dealt with according to law.