Found this on a site (have picked out what i thought was the most relevant)
Unlawful wounding/inflicting grievous bodily harm, contrary to section 20 of the Act Refer to (Archbold 19-200) for the law
55) Grievous bodily harm means serious bodily harm (Archbold 19-206). It is for the jury to decide whether the harm is serious. However, examples of what would usually amount to serious harm include:- injury resulting in permanent disability or permanent loss of sensory function;
- injury which results in more than minor permanent, visible disfigurement; broken or displaced limbs or bones, including fractured skull;
- compound fractures, broken cheek bone, jaw, ribs, etc;
- injuries which cause substantial loss of blood, usually necessitating a transfusion;
- injuries resulting in lengthy treatment or incapacity;
- psychiatric injury. As with assault occasioning actual bodily harm, appropriate expert evidence is essential to prove the injury
This is the link for the site :
Offences against the Person: Legal Guidance: The Crown Prosecution Service