Oh yes, there are many independent coffee houses in London it has to be said, and indeed a lot of good ones. However every now and again you come across one that puts the others to shame, step forward the LJ Coffee House in Soho on Winnett Street behind the Queens Theatre (Les Miserables):
Dedicated and helpful happy staff, fantastic coffee, good food, comfy chairs and a great vibe, what more could you wish for? Go and get your caffeine fix!
Oh and they have a website too: http://www.ljcoffeehouse.org.uk/community.html excellent :)