Thanks all.
I've been really lucky this time!
Referred to the local mental health team, and as I'm in the system I've started new treatment called DBT. In fact in the most positive way, I've been using the sick period to study like crazy so the result is that my Doc at mental health team is seriously impressed with not only my actions but my progression.
In other good news- it's made a massive link between my use of alcohol and my depression, so much so, I've not touched a drop since 31st May and whilst I'm not promising a totally ban for life I can honestly say, this is the longest I've not touched a drop for over 30 years. The big test will be the return to work in 10 days, but I have a few ideas for that.
So all in all, positive etc.