Is a driving ban definite for drink driving? Yes. Drink driving is a criminal offence that carries an obligatory driving disqualification of a minimum period of 12 months as laid out by the Road Traffic Offenders Act 1988 section 34(1).
A DR10 endorsements stays on your licence for 11 years I'm afraid before you can have it removed. You then apply to the DVLA and ask them to remove it. The reason being is that if you get another conviction within a 10 years period the previous ban means that the minimum ban for any new offence is at least 3 years.