Section 38B of the Terrorism Act 2000 (c.11) creates the offence of failure to disclose information that might prevent an act of terrorism or secure the apprehension, prosecution or conviction of a person for an offence involving the commission, preparation or instigation of an act of terrorism.
Sections 5(1) and (2) of the Criminal Law Act (Northern Ireland) 1967 (c.18) (N.I.) creates the offence of failure to disclose information which might secure the apprehension, prosecution or conviction of a person for an arrestable offence.