United Kingdom of Great Britain and Northern Ireland
Part 2 Arrest and delivery of persons
Warrants, custody, bail and related matters
15 Effect of delivery order
(1) A delivery order is sufficient authority for any person acting in accordance with the directions of the Secretary of State to receive the person to whom the order relates, keep him in custody and convey him to the place where he is to be delivered up into the custody of the ICC (or, as the case may be, of the state of enforcement) in accordance with arrangements made by the Secretary of State.
(2) A person in respect of whom a delivery order is in force is deemed to be in legal custody at any time when, being—
(a) in the United Kingdom, or
(b) on board a British ship, a British aircraft or a British hovercraft,
he is being taken under the order to or from any place or is being kept in custody pending his delivery up under the order.
EDIT.