A reading of 78 µg of alcohol per 100ml of breath puts you in the second of 4 sentencing brackets for this offence. Unfortunately, this means that you will face a disqualification of between 17 and 22 months. As well as this you will face either a fine or a community order. You are given credit for entering a guilty plea at the earliest opportunity and that will be applied to the part of the penalty that considers a fine or a community order. Given that you have no previous convictions and stand to lose a lot as a result of any ban, the court can consider this when imposing any penalty however they would always be bound by the guidelines and have no alternative but to impose a minimum 12 month ban. It is unlikely to be any less than 17 months in your case given the reading produced. Carefully prepared mitigation and representations made on your behalf can sometimes be the difference between a penalty at the high end of the bracket and one at the lower end. You should contact a specialist to discuss this further and get an idea of what options might be open to you.