D's liability for assisting an offence will depend on proof of: Principal offence was committed (even if P cannot be identified), D's conduct assisted P in the commission of the offence, D intended that his conduct would assist P to act with the specific intent required for the offence, D intended that his act would assist P in the commission of either: (i) a type of crime, without knowing its precise details (R v Bainbridge [1960]), (ii) one of a limited range of crimes that were within D's contemplation (Maxwell v DPP for Northern Ireland), D had not withdrawn at the time of P's offence