Masma - I hope it went well.
You have to remember Alcoholics, like other addicts will promise lots of things, when it comes to doing them, then thats a different matter. Does he have a non-drinking mate he could go to an A A meeting with?
I'm not convinced a private clinic is any better than whats available on the NHS.
If he's admitted to you he has a problem [he probably thinks it not as bad as it really is] then that is a positive.
Remember, its not your fault he is the way he is. You also need to realise if he feels he cant/wont do anything to get better, then nothing you say or do will change that. If you take or chuck away all his drink, he will a way to get more.
He is the only one who can start the recovery process, you, as heartbreaking as it is, and of course you care, can only be there to support him through it. Thinking of you and your husband and of course your son. Take care