Good Coffee in London

OK, so London is not renowned for its coffee culture, especially if you are from places like Italy, the Antipodes or just about any country that loves coffee (excluding North America, who, bless their little hearts, think that it is possible to make good coffee by percolation, filter or one of several other sub-optimal methods). BUT, there is a strong coffee culture if you know where to look.

So here is my current top 10 of coffee in London:

(OK, its not currently 10, but the list will change, and someday it will be 10).
I am using new criteria to rate coffee shops, which will eventually appear on all listings. There is an overall score, and rating for coffee, with a separate rating for milk quality (determined from a latte). I have also tried to determine whether free WiFi is available!

And here is a fancy Google map to earn some nerd points, with the next places for review marked with a '?':
View Good Coffee in London in a larger map