I have a ban for drink drive 2 years ago, can I get PCO licence now?

Sometimes a driving conviction can prevent you from getting the PCO licence. However it is upto to the Public Carriage Office to draw its own conclusions from your application. I cannot tell for sure whether you will be accepted or not so maybe you can give them a quick call and tell them about your previous driving disqualification and ask them whether you stand a chance of getting the PCO licence before you start spending money making the application.