United Kingdom of Great Britain and Northern Ireland
4 Penalties for assisting offenders.
(1) Where a person has committed [F2a relevant offence], any other person who, knowing or believing him to be guilty of the offence or of some [F3other relevant offence], does without lawful authority or reasonable excuse any act with intent to impede his apprehension or prosecution, shall be guilty of an offence.
Individual criminal responsibility
Assisting
EDIT.