Part 6
Miscellaneous
61.—
(1) In accordance with Article 27, any diplomatic immunity or state immunity attaching to a person by reason of a connection with a state party to the Statute is not a bar to proceedings under this Act in relation to the person.
(2) In this section—
“diplomatic immunity” means any privilege or immunity attaching to a person by or under section 5 of the Diplomatic Relations and Immunities Act 1967;
“state immunity” means any privilege or immunity attaching to a head of state or the prime minister, foreign minister or other representative, official or agent of a state—
(a) by virtue of any enactment (except section 5 or 6 of the said Act of 1967), or
(b) under any rule of law;
“state party to the Statute” includes a state which has accepted the jurisdiction of the International Criminal Court in accordance with Article 12 (preconditions to the exercise of jurisdiction).
Immunity - ICC proceedings
Immunity - national proceedings
EDIT.