London with no Pubs?

To drink or not to drink...
     So, as I had mentioned, traveling without snacks was kind of killer, but I barreled through and managed, once again, not to stray from the dreaded Protein Sparing Modified Fast...threw that in there in case someone was just catching up with my wildly popular little blog :oP...So are my two readers caught up? Thank you for making me feel special hunny and Noreen. Miss you by the way!
     Anyway...back to the point. So here I am in London. Back for the first time in two and a half years. And I am not supposed to drink. Now, I have been fairly strong willed about sticking to this diet thus far, I think I can say I'm proud of myself for not straying. This has been the most ridiculously stressful and chaotic month of my life. I have craved chocolate on a daily basis, but stuck with it.
     But now I find myself with a whole new kind of dilemma. I'm in London and I will inevitably go to the pub with the in-laws...do I drink a glass of wine or not? I would actually love some input here if anyone is familiar with this diet. I am wondering out loud here: are you not supposed to drink purely because of the empty calories, or is there some more serious medical reason that I'm missing.
     I'm happy to be here and visit, it has truly been too long, but anyone who has a mother-in-law can appreciate the fact that staying with them for a month (3 weeks of which my husband will not be here!) is a task that should allow for the occasional glass of wine. Not to mention, as I speak, my husband is out at the pub having "a few" beers. I'm here with the kids.... this trip will be nothing if not interesting.