[2006] EWHC 3015 (Admin)
A defendant could be criminally liable for an offence of assault if she neither entered the premises in which the assault took place nor struck any blow nor provided any active encouragement while the offence took place. A magistrates' court had been entitled to find that an offender had been party to a joint enterprise to attack the victim where the offender had watched the incident and had not done anything to stop it.
DC (Waller LJ, Lloyd-Jones J)
15/11/2006