Where a constable of a police force in England and Wales would, in relation to an offence, have power to arrest a person in England or Wales under section 24 of the Police and Criminal Evidence Act 1984 (arrest without warrant) a constable of a police force in Scotland or in Northern Ireland shall have the like power of arrest in England and Wales.
Where a constable of a police force in Scotland or in Northern Ireland arrests a person in England or Wales by virtue of subsection (1) above—
Where a constable of a police force in Scotland would, in relation to an offence, have power to arrest a person in Scotland, a constable of a police force in England and Wales or in Northern Ireland shall have the like power of arrest in Scotland.
Where a constable of a police force in England or Wales or in Northern Ireland arrests a person in Scotland by virtue of subsection (3) above, any enactment or rule of law which concerns—
applies in relation to the arrest as though the constable who effected the arrest were a constable of a police force in Scotland.
Where a constable of a police force in Northern Ireland would, in relation to an offence, have power to arrest a person in Northern Ireland under Article 26 of the Police and Criminal Evidence (Northern Ireland) Order 1989 (arrest without warrant) a constable of a police force in England and Wales or Scotland shall have the like power of arrest in Northern Ireland.
Where a constable of a police force in England and Wales or in Scotland arrests a person in Northern Ireland by virtue of subsection (5) above—
The references in subsections (1) and (2) to a constable of a police force in Scotland, and the references in subsections (3) and (4) to a constable of a police force in England and Wales, include a constable appointed under section 24 of the Railways and Transport Safety Act 2003 or under section 55 of the Energy Act 2004.
In this section “constable of a police force”, in relation to Northern Ireland, means a member of the Royal Ulster Constabulary or the Royal Ulster Constabulary Reserve.