Welcome Tiggypig.
I am glad you found this site as it has been a great source of support for me. Unfortunately, there is not a thing you can do to change him until he is ready to change. It seems like he has an idea that he has a real problem but if he is still going out and drinking that's not a good sign.
I think you would get more help in the Friends and Family section of the forum.
I am so sorry for the situation you're in.