He is definately looking at a sentence and it could be 3 1/2 years - because he used a weapon, so it will be with intent. And also because of his previous. Has he gone not guilty, If so and the prosecution witness does not turn up he may stand a chance, but other than that he will be deffo looking at a custodial sentence (he as been remanded in custody till the trial date - so that shows they will give him a custodial sentence if found guilty). My son did nothing as bad as this and was just charged with ABH sct 47 (lesser charge than GBH sct 18). He is now serviing 2 1/2 years because of his previous. Your partners offence carries a heavier sentence even without previous.