i copy this excellent answer from new judge:
"Common Assault is contrary to Section 39 of the Criminal Justice Act 1988. It is a �summary� offence (that is, it can only be heard in the magistrates� court) and the maximum penalty is six months imprisonment and/or a �5,000 fine.
The Magistrates� sentencing guidelines for a first time offender pleading not guilty suggest a community penalty. The defendant may persuade the Bench to reduce that sentence to either a fine or a Conditional Discharge if the injuries were slight. They may order compensation to the victim, and a contribution towards prosecution costs (which in most areas is about �250 for a summary offence which goes to trial) will also be ordered.
A guilty plea would almost certainly avoid a community penalty. "