BC Bar is my favourite Bar in London. Fact.
I don't concede this easily, but went for the first time as a result of going to the festival run by the same organisation in August 2005. Quite simply put, the atmosphere, the range of beverages, the food, the friendliness and helpfulness of barstaff is unsurpassed not only in other bars I have been to in London, but almost any other bar I have been to in the country.
Oh, and I got together with my girlfriend there. But that doesn't influence me at all. Honest. ;-)