21.—(1) Every person notified to the Foreign, Commonwealth and Development Office in accordance with Article 24 of the Agreement, and who is entitled to privileges and immunities pursuant to this Order, enjoy such privileges and immunities from the moment they enter the territory of the United Kingdom for the purpose of taking up of functions, or if already in its territory, from the moment when they are so notified.
(2) In respect of Family Members who become entitled to privileges and immunities under this Order under paragraph (1), they enjoy such privileges and immunities from the time the Staff Member, to whose household they belong, becomes entitled to privileges and immunities under paragraph (1).
(3) Subject to paragraph (4), when the functions of a person enjoying privileges and immunities under this Order have come to an end, privileges and immunities cease—
(a)at the moment when they leave the United Kingdom, or
(b)on expiry of a reasonable period in which to do so, and subsist until that time, even in case of armed conflict.
(4) Family Members cease to be entitled to privileges and immunities when the privileges and immunities of the Staff Member, to whose household they belong, cease pursuant to paragraph (3).
(5) In case of the death of a Staff Member, Family Members continue to enjoy the privileges and immunities to which they are entitled until the expiry of a reasonable period in which to leave the United Kingdom.
(6) Subject to article 11 of this Order, a person will continue to enjoy immunity with respect to acts performed by such a person in the exercise of their official functions within the scope of Official Activities.