Lewis--did you read my post?? I suggest that you consult legal advice as first step. You are making assumptions that are not necessarily true. I don't believe that the courts--even in the U.K. will give the children over to a demonstrated alcoholic!!!
It sounds to me like you already have a closed mind and have already decided that the situation is hopeless??!
Perhaps, you should begin to collect evidence of her drinking--but, again, you need good legal advice about how to proceed.
Alanon would be good for your support, about now.
You can do this--but, not with a stubborn closed m ind!!
dandylion