Powers of arrest and detention by French officersU.K.
4.—(1) An officer belonging to the French Republic may arrest and hold for questioning in a Control Zone in the United Kingdom a person who is being examined for the purposes of immigration control.
(2) The arrested person may be detained for a period of not more than 24 hours and, if there are exceptional circumstances and an immigration officer or a constable is notified of the extension, for a further such period.