Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 98. Enforced Disappearance
Under the UK ICC Act (2001), it is a punishable offence to commit a crime against humanity as defined in Article 7(1)(i) and (2)(i) of the 1998 ICC Statute. 
United Kingdom, ICC Act, 2001, Sections 50(1) and 51(1) (England and Wales) and Section 58(1) (Northern Ireland).