Thanks for your post.
I too drink out of habit and if I were to ask myself if I really wanted it, the answer would probably be no. It makes no sense!
It is tough when practically all social events revolve around alcohol (I'm from the UK too) and it is just the "done thing" to stock up.
I recently relpased as I thought I could jsut have a few glasses. . . fast forward a few hours later and I bought another two bottles of wine! Don't beat yourself up - you are not alone.