Part II – International Crimes and Offences Against The Administration of Justice
General Principles of Criminal Law
19. General principles of criminal law.
(1) For the purposes of proceedings for an offence against section 7 or section 8 or section 9 –
(a) the following provisions of the Statute apply, with any necessary modifications –
(x) article 32 (which relates to mistakes of fact or law);
Mistake of fact - national proceedings
Mistake of law - national proceedings
EDIT.