ABH - When Things Get Serious
Actual Bodily Harm (ABH) under s.47 Offences Against the Person Act 1861 kicks in when assault or battery causes injury. You need the original assault/battery plus harm that's "not so trivial as to be wholly insignificant" (Chan-Fook 1994).
R v Miller (1954) defined ABH as "any hurt or injury calculated to interfere with health or comfort." This includes bruises, scratches, broken noses, causing someone to vomit, or even cutting someone's hair (R v Smith 2006). Losing consciousness, even briefly, definitely counts (T v DPP 2003).
Here's what's clever about ABH - you don't need to intend the injury itself. R v Roberts (1971) and R v Savage (1991) confirmed you only need intention or recklessness about the original assault or battery. If someone gets hurt as a result, that's ABH.
Watch Out: Psychiatric injury can count as ABH, but simple fear, distress, or panic doesn't - it has to be genuine medical harm to your mental state.