On day five (so far, so sober), I had supper in Covent Garden with three friends. It was a Friday night and the words "bottle of house white" had fallen from Emma's lips almost before we sat down at our table. Thence began a debate about whether the other three could actually give up alcohol, even for a few weeks. "Of course you could," I said, "less of the Amy Winehouse act please." But did they want to? No. What's the point, they countered, if it's just a couple of glasses every night, or a few more on the weekend?