Your best hope is that your barrister can convince the CPS (before the case gets to court) or the court itself that the offence is one of 'ABH', rather than of 'GBH'. (There's no such thing as 'ABH with intent', so the 'with intent' bit is automatically lost if the lower charge is applied, or the court decides that you're not guilty of 'GBH').
It's solely the level of injuries which determine the difference betwen 'ABH' and 'GBH'. (Other factors are completely irrelevant). The Crown Prosecution Service's own guidance for its staff has this to say in relation to 'ABH' (after stating that the injuries must be 'serious'):
"In determining whether or not the injuries are serious, relevant factors may include, for example, the fact that there has been significant medical intervention and/or permanent effects have resulted. Examples may include cases where there is the need for a number of stitches (but not the superficial application of steri-strips) or a hospital procedure under anaesthetic. But there may be other factors which are also relevant and these will need to be carefully considered when deciding whether or not the injuries are serious.
Psychological harm that involves more than mere emotions such as fear, distress or panic can amount to ABH. In any case where psychiatric injury is relied upon as the basis for an allegation of ABH, and the matter is not admitted by the defence, expert evidence must be called by the prosecution"
This is the CPS guidance with regard to the definition of 'GBH':
"Grievous bodily harm means really serious bodily harm. It is for the jury to decide whether the harm is really serious. However, examples of what would usually amount to really serious harm include:
injury resulting in permanent disability, loss of sensory function or 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 or result in lengthy treatment or incapacity;
serious psychiatric injury. As with assault occasioning actual bodily harm, appropriate expert evidence is essential to prove the injury"
(Source for both quotes:
http://www.cps.gov.uk/legal/l_to_o/offences_against_the_person/ ).
If you can get the charge/conviction reduced to ABH, it might be classed as 'Category 1' (because the level of injury is near to the borderline with 'GBH' and the act of biting being seen as indicative of higher culpability). If so, a custodial sentence is inevitable, with the lowest senrtence available to the court being one of 8 months imprisonment (i.e. 12 months less a third for an early guilty plea). The maximum penalty could be three years imprisonment (or two years with an early guilty plea). Sentences can be suspended if they don't exceed 2 years, so you
might not go to prison.
If you could get the charge/conviction reduced to ABH, with the court viewing it as 'Category 2, a custodial sentence is less likely but the 'starting point' sentence is still one of 6 months imprisonment.
If the CPS (and the court) decide that the level of injuries constitutes 'GBH', then the act of biting is likely to be sufficient for 'with intent' to be successfully appended to the charge. The 'starting point' sentence for such a 'Section 18' offence is one of 4 years imprisonment at the lowest ('Category C') level. The absolute minimum sentence which can be passed is one of 2 years imprisonment (i.e. 3 years less a third for an early guilty plea), so it's just theoretically possible that the sentence could be suspended.
However, in roughly half a century of reading court cases, I've only ever seen one conviction for GBH with intent which didn't result in immediate (and lengthy) custody.
(Sentencing guidelines here:
http://www.sentencingcouncil.org.uk/wp-content/uploads/Assault_definitive_guideline_-_Crown_Court.pdf )