Tom, i think that the affect alcohol has will be a totally personal thing, you need to monitor it yourself and reach a comfort level based on your inr and what your normal state of consumption was prior to surgery.
For me, i was a heavy drinker before surgery and could drink for hours without affect, surgery took away my only talent
.
Now post surgery its obviously different, on an average day i have nothing, every few days i'll have a couple of glasses of wine and at a weekend i may have one night where i'll drink 4 glasses of wine (1bottle).
Howerver this past long weekend i've had 4 glasses of wine on saturday, 4 glasses sunday and 2 on monday, this is not a normal routine but i expect it to have no affect on my inr.
I went on a recent business trip for 10 days and drank 4 glasses of wine a day for the 10 days, i tested my inr every two days (not just for the drink but for the altered lifestyle, timezone and eating habbits) and my inr stayed rock solid. I did however drink loads of water before bed to counter any dehydration.
Roll on a thread where we can talk openly about this without feeling guilty that we shouldn't be doing it....